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  • Artikel  (3.138)
  • 2010-2014
  • 1980-1984  (3.138)
  • 1925-1929
  • 1982  (3.138)
  • Elektrotechnik, Elektronik, Nachrichtentechnik  (3.138)
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  • 2010-2014
  • 1980-1984  (3.138)
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  • 1
    Digitale Medien
    Digitale Medien
    Comparative performance of polynomial signal extraction (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 93-104 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A stochastic approximation problem for polynomic operators is formulated. The performance of polynomic operators of various degrees is compared. The effect of causality constraints is also examined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600036
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  • 2
    Digitale Medien
    Digitale Medien
    Feedback system design: The single-variate case — Part I (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 137-169 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A recently developed algebraic approach to the feedback system design problem is reviewed via the derivation of the theory in the single-variate case. This allows the simple algebraic nature of the theory to be brought to the fore while simultaneously minimizing the complexities of the presentation. Rather than simply giving a single solution to the prescribed design problem we endeavor to give a complete parameterization of the set of compensators which meet specifications. Although this might at first seem to complicate our theory it, in fact, opens the way for a sequential approach to the design problem in which one parameterizes the subset of those compensators which meet the second specification...etc. Specific problems investigated include feedback system stabilization, the tracking and disturbance rejection problem, robust design, transfer function design, pole placement, simultaneous stabilization, and stable stabilization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600050
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  • 3
    Digitale Medien
    Digitale Medien
    Editorial (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 267-268 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599010
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  • 4
    Digitale Medien
    Digitale Medien
    Rational approximation via selective modal analysis (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 433-445 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract We describe a recently developed framework for exploring the structure of linear time-invariant models of large systems, and for constructing interpretable or physically-based, reduced-order models that reproduce selected modes of the original systems to a desired accuracy. Application of this framework to constructing lumped approximations for interconnections of lumped and distributed systems is briefly explored.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599022
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  • 5
    Digitale Medien
    Digitale Medien
    The asymptotic behavior of Hermite-Padé polynomials (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 305-309 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract We present speculations on the asymptotic behavior of Hermite-Padé polynomials of type I constructed from a set of functions with common branch points. The proposed form is consistent with all known results and numerical work.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599014
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  • 6
    Digitale Medien
    Digitale Medien
    Nested-feedback-loops realization of 2-D systems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 321-343 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Algorithms are derived for representation of double power series by branched continued fractions. Some properties of the branched continued fractions are given. Two new alternative structures for realization of a two-dimensional, zero memory nonlinear transfer characteristic are proposed. These structures permit the design of 2-D systems with relatively low sensitivity of the transfer function to coefficient errors. Generalized equivalence transformations of branched continued fractions are also presented. Illustrative examples are included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599016
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  • 7
    Digitale Medien
    Digitale Medien
    Port properties of nonlinear reciprocal networks (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 77-92 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Time-invariantn-port networks are considered which are constructed from linear resistors and transformers, and nonlinear inductors and capacitors. A port property is sought which is analogous to the symmetry of the impedance matrix obtained in the linear case. Such a property is found using a stochastic characterization: with all resistors assumed to be at the one temperature and modelled to include the usual thermal noise, a fluctuating noise voltage will be observed at the ports of the networks. With some reasonable restrictions on the nature of the nonlinearities in the reactive elements, the vector of such noise voltages is shown to constitute what is known as a reversible stochastic process; in the linear case, reversibility holds if and only if the impedance matrix is symmetric.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600035
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  • 8
    Digitale Medien
    Digitale Medien
    Continuation algorithms for the eigenvalue problems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 123-134 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Three algorithms for the solution of the eigenvalue problem for a continuously parameterized family of sparse matrices are presented; a continuousLU (orLR) algorithm, a continuousQR algorithm, and a continuous Hessenberg algorithm. Each of the three algorithms may be implemented recursively and the sparsity of the given matrices is preserved throughout the numerical process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600038
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  • 9
    Digitale Medien
    Digitale Medien
    Stability analysis of complex dynamical systems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 171-202 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract We present two new algorithms to estimate the domain of attraction of the equilibriumx=0 of a nonlinear systemx=f(x). One of these algorithms utilizes quadratic Lyapunov functions while the second algorithm makes use of norm Lyapunov functions. Both of these procedures yield estimates for the domain of attraction which are comparable to those obtained by existing methods; however, the present algorithms appear to be significantly more efficient than existing algorithms. We also show how sometimes the applicability of the above results can be extended to high order systems by invoking the comparison principle. In doing so, we establish some results for the comparison principle which are of interest in their own right. Specifically, we relate the domain of attraction of a low order comparison system to the domain of attraction of a higher order system and we give an interpretation of the comparison principle in terms of stability preserving maps. In order to demonstrate the applicability of the present results, and in order to compare the present results with existing results, several specific examples are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600051
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  • 10
    Digitale Medien
    Digitale Medien
    A block matrix representation of permutation networks (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 251-266 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract This work provides a mathematical framework for topologically-independent analysis of permutation networks. First, a structure-dependent representation is provided using matrices whose entries are switching expressions. Then, a transformation is presented which maps these matrices into structure-independent representations which are matrices whose entries are 0/1 matrices. Algebraic tools for manipulating the second type of matrices are also provided. Notions such as permutations realizable by a network, the rearrangeability property, and series and parallel connections of networks are defined and discussed with regard to the proposed representations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600055
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  • 11
    Digitale Medien
    Digitale Medien
    Toeplitz equations and Kronecker's algorithm (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 289-304 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A reliable algorithm, similar to the modifed Kronecker algorithm, is provided for the solution of the Polish polynomial approximation problem. Implicit in this solution is an efficient and reliable method for the algebraic solution of Toeplitz equations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599013
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  • 12
    Digitale Medien
    Digitale Medien
    Stieltjes series and soliton interaction (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 311-320 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract TheKdV andMkdV multisoliton solutions are found to be generated by rational Stieltjes functions of the non-linearity parameter, each pole of which can be associated with a soliton. The well-known asymptotic emergence of the separate solitons follows at once from the motion of the poles. Successive (n-1/n) Padé approximants to theN-soliton series are considered to show how the solitons are reconstructed from an increasing number of perturbation terms (n ≤N). Their asymptotic behaviour is particularly striking: as time increases the behaviour of then th approximation becomes that of an actualn-soliton solution, constituted by then leading solitons. Furthermore, it turns out that each such Padé approximation satisfies a conservation law: the mass of the approximated solution, equal to that of then solitons included, is conserved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599015
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  • 13
    Digitale Medien
    Digitale Medien
    A remark on the numerics of rational approximation and the rate of convergence of equally spaced interpolation of ¦x ¦ (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 367-377 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract In this note we review the technique for rational Chebyshev approximation as given by the generalization of the Remes algorithm and point out its connection to the generalized eigenvalue problem for symmetric Hankel matrices. By a classical example and some recent work it can be shown that interpolation with rational functions (even) on equidistant knots may lead to results that are superior to Chebyshev approximation by means of polynomials for comparable numerical work.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599018
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  • 14
    Digitale Medien
    Digitale Medien
    Optimal Hankel-norm approximation of continuous-time linear systems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 407-431 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A problem on optimal approximation of continuous-time linear systems is studied. The performance measure (error) is chosen to be the spectral norm of the difference between the Hankel operators associated with the original system and the approximant. It is shown that the Hankel operators associated with continuous-time systems and the Hankel matrices associated with discrete-time systems are related by an interesting correspondence property via bilinear transforms. This fact is then used to derive the continuous-time results (theory and algorithms) from the established discrete-time ones. Some simple examples are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599021
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  • 15
    Digitale Medien
    Digitale Medien
    Scattering theory and matrix orthogonal polynomials on the real line (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 471-495 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The techniques of scattering and inverse scattering theory are used to investigate the properties of matrix orthogonal polynomials. The discrete matrix analog of the Jost function is introduced and its properties investigated. The matrix distribution function with respect to which the polynomials are orthonormal is constructed. The discrete matrix analog of the Marchenko equation is derived and used to obtain further results on the matrix Jost function and the distribution function.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599024
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  • 16
    Digitale Medien
    Digitale Medien
    An efficient large systems analysis method using system dynamic behavior (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 57-76 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract This paper presents our unified approach to the solution of large system analysis problems. The macromodular behavioral technique combines multiple-logic function macromodeling, functional latency and nested macromodel. We take advantage of the dynamic behavior and the repetitive modular structure of a system to improve the computational efficiency during system analysis. Several Bipolar and MOSFET electronic networks are used to demonstrate the merits of the macromodular behavioral method for large system analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600034
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  • 17
    Digitale Medien
    Digitale Medien
    Design of FIR digital filters using tapped cascaded FIR Subfilters (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 43-56 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract This paper considers the design of an FIR digital filter by interconnecting a number of identical FIR subfilters with the aid of a few additional multipliers and adders. The overall structure is in the form of a tapped cascaded FIR subfilters. A composite method to determine the tapping coefficients along with the coefficients of the subfilter to approximate overall frequency response characteristic is proposed. Several numerical examples illustrating the proposed method are included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600033
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  • 18
    Digitale Medien
    Digitale Medien
    A general theory of broadband matching of an active load (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 105-122 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Given a passive frequency-dependent source impedance and an active or passive load and a preassigned transducer power-gain characteristic, necessary and sufficient conditions are given for the existence of a lossless reciprocal equalizer which, when operating between the given source and the given load, yields the desired transducer power-gain characteristic. The significance of the present approach is that the realization of the equalizer involves only driving-point synthesis by the Darlington theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600037
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  • 19
    Digitale Medien
    Digitale Medien
    Editorial (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 135-135 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600049
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  • 20
    Digitale Medien
    Digitale Medien
    Semistate design theory (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 203-216 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Using semistate theory forward and reverse binary hysteresis operators are defined from which design equations result for relevant circuits. Through variation of the design parameters swept hysteresis is introduced and experimental results presented on it.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600052
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  • 21
    Digitale Medien
    Digitale Medien
    Minimum round-off noise realization of block-state recursive digital filters (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 217-231 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The development of a block-state structure with minimum round-off noise subject to ℓ2-norm dynamic range constraint is outlined. The pertinent equations for scaling and for round-off noise analysis of block-state structures implemented using fixed-point arithmetic are first derived. Next, a lower bound and the global minimum of the output noise due to the round-off of the block-state-variables are derived. A method of deriving the minimum round-off noise block state-structure is outlined. A numerical example is included. With regard to computational complexity and overall noise performance, the block-state realization of recursive digital filters is shown to be superior.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600053
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  • 22
    Digitale Medien
    Digitale Medien
    Solvability and error bounds for nonlinear circuits containing operational amplifiers (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 233-249 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Although an operational amplifier is a nonlinear device, the existing methods of analysis of circuits with operational amplifiers view it as a linear element which possibly has an infinite gain. As a result, it is not clear to what extent the results thus obtained hold. In this paper we construct a general model of a (nonlinear) circuit containing operational amplifiers. Viewing such a network as an interconnection of a multiport withn operational amplifiers, we give conditions for solvability (i.e., for the existence of an input-output operator), and establish estimates for the error incurred by replacing such a system by an idealized system whose operational amplifiers have infinite gain. In this way we determine ranges for variables within which the traditional linear analysis gives results that fulfill given accuracy requirements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600054
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  • 23
    Digitale Medien
    Digitale Medien
    Generalisations of Padé approximants (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 279-287 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A brief account is given of a number of generalisations of Padé approximants defined and studied over the past twenty years. These generalisations include multi-point approximants, approximants based upon differential equations, multivalued approximants, multivariate approximants, and approximants defined from series of orthogonal functions. The general class of Hermite-Padé approximants is discussed, and various applications are noted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599012
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  • 24
    Digitale Medien
    Digitale Medien
    Moment problems and low rank Toeplitz approximations (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 345-366 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Recent signal processing research suggests that a theory of moments for finite Toeplitz matrices and forms would help in understanding and solving certain model approximation problems. Such a theory is developed in this paper and it is shown how these moment parameterizations can make approximating by low rank Toeplitz matrices tractable. In the case of Toeplitz forms, this moment representation gives a simple solution to the extendibility problem for finite sections of a Toeplitz form.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599017
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  • 25
    Digitale Medien
    Digitale Medien
    Estimation of structure by minimum description length (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 395-406 
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    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A theorem is proved which demonstrates that an earlier derived minimum description length estimation criterion is capable of distinguishing between structures in linear models for vector processes. A fairly simple algorithm is described for the estimation of the best model, including its structure and the number of its parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599020
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  • 26
    Digitale Medien
    Digitale Medien
    Singular value analysis of deformable systems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 447-470 
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    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Singular value analysis, balancing, and approximation of a class of deformable systems are investigated. The deformable systems considered herein include several important cases of flexible aerospace vehicles and are characterized by countably infinitely many poles and zeros on the imaginary axis. The analysis relies completely on the so-called asymptotic singular value decompositon of the Hankel operator associated with the impulse response of the system. A parametric study of a six-dimensional single-input single-output case is performed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599023
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  • 27
    Digitale Medien
    Digitale Medien
    Editorial (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 1-2 
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    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600031
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  • 28
    Digitale Medien
    Digitale Medien
    System identification techniques for adaptive signal processing (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 3-41 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Many problems in adaptive filtering can be approached from the point of view of system identification. The close interconnection between these two disciplines is explored in some detail. This approach makes it possible to apply recursive parameter estimation algorithms to adaptive signal processing. Several examples are discussed including: adaptive line enhancement, generalized adaptive noise cancelling, adaptive deconvolution and adaptive TDOA estimation. It is shown how the recursive maximum likelihood algorithm can be used for both FIR and IIR filtering, and some preliminary results are presented. Several alternative algorithms are briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01600032
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  • 29
    Digitale Medien
    Digitale Medien
    Special issue on rational approximations for systems (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 269-278 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Conclusions To conclude our discussion we can only confess to our shortcomings as organizers and editors. We have been incomplete, we have been biased, and, worst of all, we have not been able to produce the most essential connections in any firm way. Perhaps our major achievement — if we may say so — has been to point the way to many possible new results and to new research. The field discussed here seemed at first very conventional. May we have convinced the reader that it is not. That the major problems have not been solved. That here lies an open field for system engineers, numerical analysts, and mathematicians.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599011
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  • 30
    Digitale Medien
    Digitale Medien
    Contractive intertwining dilations and norm approximation techniques (1982)
    Springer
    Circuits, systems and signal processing 1 (1982), S. 379-394 
    Details
    ISSN: 1531-5878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Recent results in labelling all contractive intertwining dilations and in studying connections between labellings are presented. These facts are used to describe the general solution of the Carathéodory-Fejér extrapolation problem. This turns out to be useful for some numerical problems such as: computation of the norm of an analytic Toeplitz matrix, an algorithm for detecting reflection coefficients in seismic exploration, and a model for controlling the errors in Wiener prediction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01599019
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  • 31
    Digitale Medien
    Digitale Medien
    Influence of coherence and misalignment on the complex amplitude addition and subtraction by holographic Fourier transformation (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 217-223 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract General results are given for the influence of coherence and misalignment on the complex amplitude addition and subtraction by holographic Fourier transformation. For the method of Gaboret al. we have investigated the effects of longitudinal and transverse misalignment of the recording material between the first and second exposure. A method for complex addition and subtraction of Fourier transforms is investigated also.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619601
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  • 32
    Digitale Medien
    Digitale Medien
    Spatially inhomogeneous carrier concentration dependence of the reflectivity of semiconductors (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 245-251 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The excite-and-probe technique was used to study the optically induced charge carrier concentration dependence of the reflectivity of semiconductors, both experimentally and theoretically, in the case of an exponential carrier distribution. The second harmonic of an Nd : YAG laser (pulse duration 25 ps) was used as the exciting beam; the fundamental wave served as the probe beam. At a carrier concentration of about 2.5×1021 cm−3 a minimum reflectivity was obtained if the angle of incidence was greater than 40°. For increasing absorption constants of the semiconductor at the exciting frequency, this minimum value of the reflectivity was shown to increase. The dependence of the reflectivity on the exponentially distributed carrier concentration was studied experimentally for thin amorphous silicon films produced by the glow-discharge technique. For an absorption constant of 6×105 cm−1 at 532 nm, good agreement was found between the numerical calculations and the experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619604
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  • 33
    Digitale Medien
    Digitale Medien
    Application du contrôle de l'autofocalisation dans CS2 au raccourcissement d'impulsions laser picoseconde (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 253-261 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Beschreibung / Inhaltsverzeichnis: Abstract This paper deals with self-focusing of picosecond laser pulses due to the optical Kerr effect in CS2. It describes experimental techniques by which the self-focusing process can be controlled with a good degree of spatial and temporal reproducibility. It includes applications to the frequency modulation of light pulses. Appropriate combination of this modulation with linear amplitude filtering results in pulse shortening of a 30 ps pulse by a factor of 30.
    Notizen: Résumé Nous décrivons plusieurs techniques expérimentales qui permettent de maîtriser le phénomène d'autofocalisation d'un faisceau laser ‘picoseconde’ dans un matériau présentant l'effet Kerr optique. Sous certaines conditions, ce phénomène est suffisamment prévisible et reproductible dans le temps et dans l'espace pour produire des impulsions picoseconde présentant certaines lois contrôlées de modulation de fréquences temporelles. Enfin, nous montrons comment des impulsions laser de durée initiale 30 ps modulées convenablement en fréquence par autofocalisation contrôlée dans CS2 peuvent être raccourcies d'un facteur 30 environ par filtrage passif d'amplitude.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619605
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  • 34
    Digitale Medien
    Digitale Medien
    Analytical continuation of LP0n modes beyond cut-off in optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 280-282 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619608
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  • 35
    Digitale Medien
    Digitale Medien
    Semiconductor laser bistable operation with an adjustable trigger (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 321-326 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Hysteresis is demonstrated in the light output versus current characteristics of twin-stripe injection lasers subject to optical injection. The sensitivity of the device to optical injection is adjustable and allows an adjustable switch for bistable operation to be defined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619743
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  • 36
    Digitale Medien
    Digitale Medien
    Radiative and nonradiative recombination times in semiconducting films (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 331-338 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The radiation emitted spontaneously by a semiconductor which has been excited for a very short time decays exponentially with a time constant that depends on the recombination rate of electrons and holes. This recombination rate is the combination of radiative and nonradiative transition rates between conduction and valence bands of the semiconductor. The radiative recombination rate depends on the density of states of the electromagnetic field, which can be made to be dependent on the geometry. In this paper, we report on the dependence of the fluorescence lifetime upon the thickness of active thin films. For systems in which the radiative recombination rate is dominant over the nonradiative ones, the total recombination time can be changed by suitable modifications of the thickness of the film. In this situation, the nonradiative rate can be evaluated. We present experimental results for the case of cadmium sulphide (CdS) thin films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619745
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  • 37
    Digitale Medien
    Digitale Medien
    Two-wavelength and power-balanced oscillation of a CO2 laser for application to differential absorption measurements (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 339-346 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A new technique of alternate two-wavelength oscillation of a CO2 laser is discussed for application to various differential absorption spectroscopic measurements. Power-balanced, two-adjacent branch oscillation using a single CO2 laser was achieved by modulating the angle of a mirror inside the laser cavity and adjusting automatically the cavity length. The two-wavelength modulation frequency was extended up to about 1.2 kHz. Line tuning and power modulation characteristics were studied. The laser was used in long-path differential absorption measurements of ethylene air pollution molecules to demonstrate the capability of this power-balanced, two-wavelength oscillation method. The minimum detectable absorption was nearly 1×10−3 in a short-path cell experiment and 3×10−3 in a long-path experiment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619746
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  • 38
    Digitale Medien
    Digitale Medien
    Polarization states in twisted optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 371-374 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619751
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  • 39
    Digitale Medien
    Digitale Medien
    Statistical and coherence effects in nonlinear optical parametric up conversion. I. Coherent interaction (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 425-431 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The distinction between coherent and incoherent nonlinear optical interactions is established at the beginning of the paper. In the first part parametric up conversion (PUC) by coherent nonlinear optical mixing of the strong pumping radiation with weak input radiation is treated with respect to statistical properties of generating radiations. The efficiency of PUC is calculated by means of the conserved statistics method. It is shown that the efficiency of PUC depends upon the photon statistics of the strong pumping radiation only, namely, it decreases with increasing fluctuation level in the pumping radiation. The fourth-order statistics of generated sum-frequency radiation is calculated in the first approximation of the iterative solution. The statistics of both generating radiations are projected into the statistical distribution of the resulting sum-frequency radiation in the same way at the beginning of the process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620428
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  • 40
    Digitale Medien
    Digitale Medien
    Commentaires sur la détermination de la loi de luminance L(P,θ) d'une source semi-conductrice en champ proche (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 445-451 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract This paper presents a theoretical and experimental study of the application of the near field technique to the measure of radiance of light emitting diodes and laser diodes. We have shown the possibilities and the limitations of this technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620430
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  • 41
    Digitale Medien
    Digitale Medien
    Transverse mode oscillations at GHz frequencies in stripe-geometry lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 465-466 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620433
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  • 42
    Digitale Medien
    Digitale Medien
    Equivalent step-index profile for graded W-fibres: application to TE01 mode cut-off (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 483-499 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Snyder's equivalent step-index method is extended to the case of graded profiles with a depressed cladding. This method is then used to determine the limit of monomode operation. Comparison with the results obtained by an exact numerical technique is made for a large variety of simulated profiles, including those with ripples in the cladding. Conclusions are drawn concerning the sensitivity of various profile-shapes to such ripple structure. The method is applied also to measured profiles, reconstructed by a well-known tomographic procedure. In this latter case a comparison is made with experimentally determined values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610305
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  • 43
    Digitale Medien
    Digitale Medien
    A new theory of rectangular optical waveguides (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 525-537 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A new theoretical treatment of the dispersion theory for rectangular optical waveguides is presented. The theoretical basis of the effective dielectric constant method is investigated, and it shows how corrections can be calculated systematically. The result is a new set of eigenvalue equations, simple in form, and which provide very accurate values for the propagation constant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610308
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  • 44
    Digitale Medien
    Digitale Medien
    Energy transfer between two beams in writing a reflection volume hologram in a dynamic medium (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 547-556 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A theoretical study is presented of the stationary energy transfer between two beams in the writing of a reflection hologram in a dynamic medium. The intensities of the two beams both inside the medium and at the surfaces are determined as a function of absorption coefficient, the effective coupling constant, the initial intensity ratio and the thickness of the medium. Numerical results obtained from the computer calculations are presented in graphical form.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610310
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  • 45
    Digitale Medien
    Digitale Medien
    Représentation paramétrique suivant les polynômes de Legendre de l'intensité lumineuse émise par une DEL et une extrémité de fibre optique (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 77-80 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620914
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  • 46
    Digitale Medien
    Digitale Medien
    Variation in the diameter of an optical fibre: a simple experiment (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 89-91 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620917
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  • 47
    Digitale Medien
    Digitale Medien
    Optical tuning of a tellurium cavity: optical modulation and bistability in the infrared region at room temperature (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 157-167 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A new optical-optical modulator for the infrared region (4μm 〈λ 〈 11μm) is described. It is based on the tuning of the transmission of a plane parallel tellurium slab by free carriers created by multiphoton absorption of 10.6μm and 5.3μm radiation at room temperature. The operation of this device is described by a simple theory using the plane-wave approximation and the Drude-Zehner model. The assumptions of this theory were fulfilled by the experimental conditions, permitting a quantitative analysis of the registered modulations. Under certain working conditions pulse shortening (170 ns pulses ofλ=5.3μm were shortened by up to 20 ns) and fast switch-on of the device (switch-on time ⩽2 ns) were observed. Moreover, the modulator exhibits limiter action and optical bistability which, for the first time, is observed in an intrinsic semiconductor device at room temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620368
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  • 48
    Digitale Medien
    Digitale Medien
    A high-speed optical receiver (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 61-66 
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    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The design and performance of a high-speed optical receiver for the 1.3μm and 1.5μm wavelength regions is described. The receiver comprises an InGaAs PIN photodiode feeding into a bipolar transimpedance preamplifier. Measured receiver characteristics are found to compare favourably with theoretical predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620911
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  • 49
    Digitale Medien
    Digitale Medien
    Modified near-field intensity scanning of step-index fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 73-76 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620913
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  • 50
    Digitale Medien
    Digitale Medien
    Fabrication of efficient phase gratings using deep u. v. lithography (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 85-88 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620916
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  • 51
    Digitale Medien
    Digitale Medien
    Components and systems for long-wavelength monomode fibre transmission (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 95-143 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract This review discusses the requirements and constraints on components for long-wavelength monomode systems. In particular it critically reviews the current status of fibre, splicing, cabling, laser, detector, receiver and systems research; emphasis is placed on practical achievements rather than just speculative possibilities. The review concludes with a brief assessment of the future role of guided-wave optical devices.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620366
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  • 52
    Digitale Medien
    Digitale Medien
    Beam propagation in elliptical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 225-236 
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    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We apply an operator method, based on the scalar wave equation, to study the propagation of a Gaussian light beam in an optical fibre with an arbitrary, elliptically symmetric refractive-index profile. We discover that ray optical results, while not capable of predicting the rapid distortion of an optical beam in a non-ideal refractive-index profile, successfully simulate the general form of the optical power distributions, even in non-ideal profiles. We find that the propagation patterns for elliptical fibres with and without a strongly scattering central index dip show several unexpected similarities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619602
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  • 53
    Digitale Medien
    Digitale Medien
    A multipole formalism for describing radiative pulse evolution in degenerate transitions of gaseous media (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 201-215 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A general method is introduced for modelling coherent radiative and propagational processes at optical and near-optical frequencies in degenerate transitions of gaseous atomic and molecular systems. A ‘Blochtensorial’ expansion is used to describe the coherent behaviour of the system, and is applicable to P-, Q- and R-type transitions. Time-dependent solutions of the high-order multipole Maxwell-Bloch equations are obtained for irradiation of the systems by both linearly polarized and circularly polarized incident fields. These lead to important predictions of pulse evolution behaviour in degenerate amplifier and absorber systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619600
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  • 54
    Digitale Medien
    Digitale Medien
    Single longitudinal and transverse mode operation of a hybrid unstable resonator TE CO2 laser (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 237-243 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Single-mode operation of an atmospheric-pressure TE CO2 laser is reported. Single longitudinal mode emission has been achieved by incorporating a low-pressure, transversely excited gain section in the same laser cavity as the atmospheric-pressure section. The effects of different resonator configurations on the system modal behaviour have been investigated and it is shown that unstable resonators are particularly suitable for controlling the transverse mode structure with a complete coverage of the excited medium. With an unstable resonator configuration, formed by a metallic convex mirror and a plane diffraction grating, single longitudinal and single transverse mode output pulses with energy up to 2 J have been produced on more than 40 lines of both the 9.4μ m and 10.4μ m bands. This technique can easily be scaled to larger aperture devices at higher extracted energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619603
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  • 55
    Digitale Medien
    Digitale Medien
    Bistable operation of a GaAs-AlGaAs diode laser coupled to an external resonator of narrow spectral bandwidth (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 375-389 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The influence of an external dispersive resonator on the emission properties of a double heterostructure semiconductor laser operating at room temperature has been investigated. The proper design of the external resonator (frequency selectivity and efficient back-coupling of the radiation leaving the diode) demonstrates that a laser with optical feedback can show bistability and hysteresis phenomena. The dispersive bistability has its origin in the dependence of the refractive index on carrier density, temperature and optical power. Hysteresis curves have been measured by changing the injection current or by tuning the dispersive element. We have found a threshold in the injection current for the onset of the hysteretic behaviour. Moreover, a theoretical model has been established to explain the essential features of the experimental results. Hysteresis cycles for different experiments have been calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620422
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  • 56
    Digitale Medien
    Digitale Medien
    Tunable large angular aperture TeO2 acousto-optic filters for use in the 1.0–1.6 μm region (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 413-417 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The design of tunable large angular aperture TeO2 noncollinear acousto-optic filters for use in the 1.0–1.6μm region is discussed. It is shown that it is possible to maximize the angular aperture of such a filter by the correct choice of the direction for the acoustic wave vector and that this required direction is independent of the operating wavelength in the range 1.0–1.6μm. The theoretical model adopted is verified by comparison with experimentally measured filter characteristics and the design of filters with narrow bandwidths and low power requirements is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620426
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  • 57
    Digitale Medien
    Digitale Medien
    Statistical and coherence effects in nonlinear optical parametric up conversion. II. Incoherent interaction (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 433-444 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Parametric up conversion (PUC) by incoherent nonlinear optical mixing of second-order coherent strong pumping radiation and another weak chaotic input radiation with a finite spectral width is treated in the second part of this paper. The efficiency of PUC is calculated in the second approximation of the iterative method. It is shown that in the case of perfect phase matching the efficiency of PUC decreases with increase of both the spectral width of the input radiation and the dispersion of medium, whilst at considerable values of phase mismatch the reverse effect appears. The spectral distribution of the resulting sum-frequency radiation is calculated in the first approximation of the iterative method. There is a general tendency to narrowing of the spectral distribution of the generated radiation in the course of PUC. Moreover, when there is a phase mismatch present, a spectral shift of the central maximum of generated radiation towards the blue or red region, according to the signs of the phase mismatch and the typical dispersion coefficient, appears in the later phases of the PUC.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620429
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  • 58
    Digitale Medien
    Digitale Medien
    Second harmonic generation with noncollinear focusing (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 467-474 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The propagation of off-axis Gaussian beams through an optical system is described in the paraxial approximation. The formulae for the second harmonic power for stationary focused noncollinear SHG is given. Numerical results and analytical approximations for limiting cases are provided. The theory is applied to the problem of background of noncollinear SHG in pulse duration measurement techniques.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610303
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  • 59
    Digitale Medien
    Digitale Medien
    Ion aging effects on the dissociative-attachment instability in CO2 lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 501-513 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Onset of the dissociative-attachment instability requires that the rate coefficient for electron detachment (k d) from negative ions be below a critical value. The predominant negative and positive ions in a CO2∶N2∶He gas-discharge plasma are known to change with time. As secondary by-products form and the predominant negative-ion species changes from CO 3 − to NO 2 − , a decrease ink d occurs destabilizing the discharge. Since NO 2 − and NO 3 − are largely unreactive with respect to associative detachment,k d depends in a sensitive fashion on the concentration of certain minority negative ions (O−, O 2 − ) and neutrals (CO, O, N). The sufficient conditions for the dissociative-attachment instability are much less sensitive to changes in the electron-ion and ion-ion recombination rate coefficients resulting from the ion aging process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610306
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  • 60
    Digitale Medien
    Digitale Medien
    Simultaneous diffraction of two waves at a reflection volume hologram (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 539-546 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Based on the theory of coupled waves the simultaneous diffraction of two waves at a plane dielectric reflection volume hologram is described. By analogy to the transmission volume grating the intensities of the output beams strongly depend on the phase shift between the incident waves and the phase shift of the grating with respect to the interference structure of the read-out waves. This gives the possibility of transferring the incident energy from one wave into the other and can be used for the modulation or deflection of the reconstructed beams. The separate determination of the different kinds of phase shifts by intensity or phase measurements is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610309
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  • 61
    Digitale Medien
    Digitale Medien
    Phase-conjugate reflection through degenerate four-wave mixing in gallium phosphide (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 81-84 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620915
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  • 62
    Digitale Medien
    Digitale Medien
    High-order comb spectrum from stimulated raman scattering in a silica-core fibre (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 92-93 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620918
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  • 63
    Digitale Medien
    Digitale Medien
    On the influence of spatial hole-burning on mode selection and mode synchronization in a CW laser (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 145-155 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The influence of spatial saturation modulation of both the amplifier and absorber in a laser with a Fabry-Perot resonator, and of the associated Bragg-reflection, on the frequency-dependent losses necessary for single-frequency operation, as well as on the frequency synchronization of three modes, has been examined. Conditions for mode selection and mode synchronization are given. To achieve single-frequency operation in a laser with a Fabry-Perot resonator the loss difference between the mode to be selected and modes to be quenched has to be proportional to the Bragg losses of the selected mode suffered by its self-induced grating. The proportionality factor depends on the length and position of the amplifier in the cavity. In the case of a short amplifier and a short absorber inside the resonator, the discussion of conditions for synchronization of three modes shows that the synchronization regime is also determined by the position of the absorber.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620367
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  • 64
    Digitale Medien
    Digitale Medien
    Simple dispersion measurement of a long-span, single-mode fibre using the longitudinal mode spacing of a semiconductor laser (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 183-187 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A simple method for measuring dispersion in long-span single-mode fibre, by using directly modulated multi-longitudinal mode semiconductor lasers, is proposed. Experimental values for single-mode fibre dispersion over a 44.3km span at 1.1 and 1.5μm are 19 and 17 ps km−1 nm−1, respectively, and are in good agreement with Gloge's theory. The zero-dispersion wavelength estimated from the experimental results is about 1.28μm, 8 nm shorter than the theoretical value.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620371
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  • 65
    Digitale Medien
    Digitale Medien
    Kinetic modelling of a fast-axial-flow CO2 laser (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 25-40 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A six-temperature Boltzmann-equilibrium kinetics model has been developed for simulating the performance of fast-axial-flow, longitudinal-discharge CO2 lasers. The model includes the effects of electrical excitation, VV and VT collisional relaxation, thermal energy transport, distributed optical losses, and coherent radiation extraction for a CO2/N2/He/H2O mixture. Numerical predictions from the model are compared with experimental results obtained with a 2.5 kW device.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620907
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  • 66
    Digitale Medien
    Digitale Medien
    Optically induced spatial instability in twin-stripe-geometry lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 177-181 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The use of light injection to modify the lateral gain profile in twin-stripe injection lasers is described and consequent movement of the lasing optical field is demonstrated. A method of quantifying the sensitivity of the device to light injection is described and used to examine the dependence of optical instability upon injection current.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620370
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  • 67
    Digitale Medien
    Digitale Medien
    A plane wave derivation of the Bragg acoustooptic equations and their application to the scattering of finite-width optical beams (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 189-200 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The equations describing the interaction between an optical beam and an acoustic wave are derived using plane waves derived from elementary scattering sources. The results obtained are in good agreement with other well-known methods such as the differential difference equation approach. The equations are applied to the acousto-optic interaction in the weak and strong approximations and also to the scattering of finite-width optical beams with rectangular and Gaussian profiles. It is shown that in both cases the second or backscattered beam (A′ 0) produces a substantial modification in the through beam (A 0) resulting in an intensity null at some point in the beam profile. Equations are derived for the diffraction efficiency in finite-width beams and it is shown that in order to achieve maximum efficiencies it is essential to use small values of the parameter γ =Lθ B/W.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619599
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  • 68
    Digitale Medien
    Digitale Medien
    Diffusion and waveguiding effects in twin-stripe injection lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 169-176 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The properties of the twin-stripe injection laser are examined as functions of two parameters governing diffusion and waveguiding effects in the device. The carrier diffusion rate, as determined by the ambipolar diffusion coefficient,D, is shown to influence the current range over which lasing action is maintained. The curvature of the nonlinear portion of the light-current characteristic of the device is also changed asD is altered. It is found that the relative strengths of the guiding mechanisms acting upon the optical field further influence the characteristics of the structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620369
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  • 69
    Digitale Medien
    Digitale Medien
    Anomalous absorption in volume gratings: a modal approach (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 277-279 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619607
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  • 70
    Digitale Medien
    Digitale Medien
    Dichromated gelatin for volume holographic recording with high sensitivity. Part I (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 311-315 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Dichromated gelatin would be the most suitable irreversible medium for holographic recording but for its low sensitivity. The efficiency of the photoinduced reduction of the chromium ion increases considerably if superfine grains of silver halide crystals are present in the layer. The light sensitivity achieved is about 10 times better than that of dichromated gelatin layers, obtained and processed in the conventional way.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619741
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  • 71
    Digitale Medien
    Digitale Medien
    Influence of weak reflections from anti-reflection coated surfaces on CO2 laser optics design (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 327-330 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The influence of interference due to weak reflections from anti-reflection coated surfaces in CO2 laser optics is discussed and analysed. In certain cases quite low reflection levels (∼1%) are shown to lead to uncertainties in the mirror transmission coefficient or produce a non-uniform power loading on the mirror surface, resulting in damage.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619744
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  • 72
    Digitale Medien
    Digitale Medien
    On the spatial-frequency dependence of phase-conjugate wavefront reflectivity in photorefractive Bi12GeO20 crystals (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 363-365 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619749
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  • 73
    Digitale Medien
    Digitale Medien
    Effect of random motion on synthetic aperture radar imagery (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 263-275 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We consider the effect of the random motion of capillary waves on the mean intensity and the contrast of the images of dynamic ocean surfaces, with such features as surface waves and current boundaries, produced by a synthetic aperture radar (SAR).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619606
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  • 74
    Digitale Medien
    Digitale Medien
    Theory of scattering in multimode optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 283-309 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The problem of scattering in multimode optical fibres is treated in a rigorous way by means of both a ray and a statistical approach. These two methods are interlaced and harmonized. Applications to microbending, ellipticity, core radius and maximum numerical aperture variations, and fluctuations of index profile shape are performed. Useful results about power distribution and fibre attenuation are derived in each case.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619740
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  • 75
    Digitale Medien
    Digitale Medien
    Dichromated gelatin for volume holographic recording with high sensitivity. Part II (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 317-320 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A method is described to raise the sensitivity of dichromated gelatin layers by hardening them before exposure, with compounds binding not the carboxyl but the amino groups of the gelatin molecules. The experiments showed a tenfold increase in the light sensitivity of the layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619742
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  • 76
    Digitale Medien
    Digitale Medien
    Characterization and design of single-mode optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 347-358 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract This paper deals with profile-independent characterization and design of single-mode optical fibres. Only two or three moments of the refractive-index profile are required rather than its exact form. Thus only a few parameters need be measured and simple formulae result for calculating microbending loss and dispersion in arbitrary fibres. These formulae are used to discuss various fibre design criteria. The use of preform data and the theoretical description of the preform-to-fibre process are considered. The method presented is compared with equivalent-step methods, which are briefly reviewed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619747
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  • 77
    Digitale Medien
    Digitale Medien
    Monomode fibre microbending loss measurements and their interpretation (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 359-362 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619748
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  • 78
    Digitale Medien
    Digitale Medien
    A simple technique for real time pulsewidth measurements of single ultrashort laser pulses (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 391-394 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A simple technique is described employing noncollinear second harmonic generation, for real time measurement of the pulse duration of individual pulses in the 1 ps to 1 ns range. The pulsewidth is derived from the recorded two points of the second-order autocorrelation function. The system may be used as a permanent on-line monitor of the pulsewidth.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620423
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  • 79
    Digitale Medien
    Digitale Medien
    Mode cutoff frequencies in elliptical and large numerical aperture optical fibres (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 419-424 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract It is shown that by perturbation of the weakly-guiding, circular fibre, it is possible to obtain, in a straightforward way, accurate information about the cutoff characteristics of the higher-order modes in optical fibres having either an elliptical cross-section (with aspect ratios as large as 2∶1) or a relatively large numerical aperture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620427
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  • 80
    Digitale Medien
    Digitale Medien
    Time behaviour of the spectral properties of dye lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 453-459 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The spectral narrowing that occurs in the build-up regime of lasers with strongly homogeneously broadened emission lines, is studied numerically in the dye laser case. It turns out that in the first stage (up to a few nanoseconds, depending on the pumping power) this narrowing process is rather rapid, reducing the linewidth by a factor of about five, while it becomes slower and slower during further evolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620431
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  • 81
    Digitale Medien
    Digitale Medien
    Study of polymerization by intensity fluctuation spectroscopy (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 461-463 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620432
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  • 82
    Digitale Medien
    Digitale Medien
    The controlled non-linear evolution of TE and TH ps-pulses in Selfoc fibre (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 475-482 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The threshold amplitude values for fundamental and higher TE and TH modes of intense ps-pulses in Selfoc optical fibres responsible for non-linear self-constriction of these pulses are determined. The non-linear stabilization of TH pulses in the vicinity of these thresholds may be associated with smaller amplitudes than for TE ones. The characteristic scales of non-linear evolution, calculated for higher modes are longer than for fundamental modes. The asymmetric evolution of initially symmetric ps-pulses due to the relaxation of non-linearity is analysed both for self-constriction and self-spreading of such pulses. The exact analytical solutions described the intense ps-pulse rebuilding in the framework of the ‘inverse scattering method’ and non-linear geometric optics are obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610304
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  • 83
    Digitale Medien
    Digitale Medien
    Spatial coherence of laser light propagating in an optical fibre (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 515-523 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The modulus of the complex degree of spatial coherence at the exit face of an optical fibre is determined for a quasi-monochromatic, spatially coherent source. It is found that the contribution of the cross-terms between many modes to the formulus of pointwise correlation is negligible for a highly multimode fibre in which even and odd modes are equally excited, although care must be taken when even or odd modes only are selectively excited in the waveguide. Experimental results obtained by using a Koesters prism in the wavefront reversing interferometer are also presented for a graded-index multimode fibre and a quasi-single mode fibre. Modal contents of the propagating field in the optical fibre can be successfully determined, provided that the coherence time of a quasi-monochromatic source and the path difference of the wavefront reversing system are knowna priori.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610307
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  • 84
    Digitale Medien
    Digitale Medien
    Effect of atmospheric turbulence on optical pulsed ranging accuracy (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 401-411 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The effect of atmospheric turbulence on optical pulsed ranging accuracy is investigated assuming a Poisson detection process and multivariate log-normal scintillation. Expressions for the detection cell and the rms detection error in the presence of atmospheric scintillation are derived generally, and evaluated numerically for various optical Gaussian pulse shapes in the case where the optical pulse duration is sufficiently short compared with the correlation time of the atmospheric scintillation (complete cell-to-cell correlation case). Numerical results indicate that the rms detection error increases with increasing correlation, while the detection probability decreases with increasing correlation. It is also found that the detection error depends increasingly on the pulse width and the resolution time of the photodetector with increasing correlation in the presence of atmospheric scintillation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620425
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  • 85
    Digitale Medien
    Digitale Medien
    A tunnelling correction factor for the modified near-field technique (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 17-24 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A tunnelling correction factor is derived for modified near-field scanning. This correction is insensitive to core profile shape and can be accurately applied to fibres with core noncircularity. Examples are given which demonstrate its accuracy for both step- and parabolic-index core fibres.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620906
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  • 86
    Digitale Medien
    Digitale Medien
    Comparison of BJT and MESFET front ends in broadband optical transimpedance preamplifiers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 57-60 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We show in this paper that little noise penalty is incurred by using readily available bipolar junction transistors in place of GaAs MESFETs in the first stage of high-speed optical transimpedance preamplifiers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620910
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  • 87
    Digitale Medien
    Digitale Medien
    Detection of picosecond laser pulses with nanosecond time resolution by use of analogue-to-digital converters (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 67-71 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A photodetector-analogue-to-digital converter system with 1.8 ns rise and decay time is described. The photodetector waveform is fanned-out with power splitters and sampled with high-speed analogue-to-digital converters. The system is used to detect picosecond light pulses from a mode-locked Nd-glass laser with nanosecond time resolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620912
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  • 88
    Digitale Medien
    Digitale Medien
    Development of a fast risetime pulsed relativistic electron beam generator for the excitation of shorter wavelength lasers (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 395-399 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We have developed a compact and simple high current relativistic electron beam (REB) generator for the excitation of lasers in the shorter wavelength region. This REB generator mainly consists of a Tesla transformer-type high-voltage generator, N2 gas insulated Blumlein-type pulse-forming line and cold-cathode electron gun to generate 800 keV, 12 kA pulsed electron beams with 6 ns current duration and approximately 4 ns current risetime. The design and operational characteristics along with discussions of the excitation capabilities of the gas laser media are presented in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620424
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  • 89
    Digitale Medien
    Digitale Medien
    The fundamental mode of graded-index fibres: simple and accurate variational methods (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 7-15 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract In this paper, we present two approximations for the fundamental mode of graded-index fibres. The first is a one-parameter analysis which involves computational effort comparable to that involved in the Gaussian approximation and yet gives much better results. The second is a two-parameter analysis which gives much better results than other existing approximations for all values ofV for most graded-index fibres.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620905
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  • 90
    Digitale Medien
    Digitale Medien
    Long-range optical fibre backscatter loss signatures using t wo-point processing (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 41-49 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The ability of the two-point technique to obtain accurate backscatter loss signatures for fibre systems with long repeater spacing is investigated. A systematic analysis of the attenuation range capability of two-point processing is presented and a predicted measurement range of 40 dB one-way fibre attenuation verified by measurement. The analysis takes into account the effect of receiver bandwidth, quantization noise and A–D converter nonlinearity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620908
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  • 91
    Digitale Medien
    Digitale Medien
    Transient gratings in a nonlinear medium (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 51-56 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The excitation of a phase transient grating induced by two equal pulses from the same laser, which intersect in a nonlinear (cubic) medium, is considered theoretically. The grating parameters are calculated. The grating amplitude is shown to be spatially non-uniform and to be described by the pulse autocorrelation function, a display of the pulse coherence and of the two-pulse interference pattern. The diffraction problem of the induced grating is then solved using the electrodynamic perturbation theory. The diffraction efficiency of the grating is calculated. It is shown that the measurement of the spectral intensity of the probe light diffracted from the induced grating enables the complete computation of the grating amplitude. Such a measurement may be carried out for the whole of the time of grating decay after the excitation of the grating. Some possible applications of the induced grating are considered. The medium parameters and the autocorrelation trace of the single pulse may be determined. The shape and duration of a bandwidth-limited pulse or the spectrum of an arbitrary one are shown to be measurable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620909
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  • 92
    Digitale Medien
    Digitale Medien
    Comparison of theory and experiment in electron-beam-controlled CO2 laser oscillators (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 1-6 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A four-temperature model describing the electron-beam-controlled CO2 pulsed laser has been developed and used to study the time evolution of a laser pulse and the influence thereon of experimental parameters. This paper explains the experimental results of two different electron-beam CO2 pulsed laser systems which have been built in the laboratories at Frascati.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00620904
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  • 93
    Digitale Medien
    Digitale Medien
    Observations of interference between a signal and its conjugate in a four-wave mixing experiment using Bi12GeO20 crystals (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 367-369 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619750
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  • 94
    Digitale Medien
    Digitale Medien
    Electrodissolution of synthetic covellite in hydrochloric acid (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 369-376 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A systematic study has been undertaken to investigate the anodic dissolution characteristics of impure commercial and synthetic covellite. It has been observed that the dissolution is strongly influenced by the pH and chloride concentration and also shows a typical active-passive type of behaviour with production of elemental sulphur. The rate of the dissolution process is accelerated by the formation of a CuCl 2 − complex at high chloride concentrations whereas at lower concentrations of hydrochloric acid the electrochemical oxidation to sulphate is predominant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00615104
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  • 95
    Digitale Medien
    Digitale Medien
    The reaction occurring between gaseous CF4 and oxides dissolved in different molten fluorides. Some practical aspects (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 411-416 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract When CF4 is bubbled through molten fluorides containing dissolved oxides within the range 900–1020° C, a chemical reaction takes place which decreases the oxide concentration and yields CO2 and F− ions. The possibility of the reaction between the CF4 evolved at the anode and dissolved alumina, occurring during the anode effect in aluminium reduction cells, is discussed. This reaction provides a simple and convenient method for removing oxides and hydroxides from molten fluorides.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610482
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  • 96
    Digitale Medien
    Digitale Medien
    The electrochemistry of partially discharged Planté electrodes (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 469-478 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The electrochemistry of partially discharged Planté electrodes has been investigated. The reduction of partially discharged electrodes continues in the manner expected for a crystallization and growth limited electrode process. The oxidation of partially discharged Planté electrodes is less well defined and it appears that the effects due to nucleation of lead sulphate are removed by the initial discharge from the fully charged condition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610489
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  • 97
    Digitale Medien
    Digitale Medien
    Alternating current impedance studies on oxide films in metal/oxide/electrolyte systems: a modified approach (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 487-496 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The accurate determination of the impedance of oxide films in metal/oxide/electrolyte systems is shown to be possible through a modified procedure. The film impedance thus determined is found to be quite different from the measured cell impedance for anodic aluminium oxide formed on pure aluminium. The computed values of tan δ and conductivity are found to be in agreement with the values reported earlier for anodic and thermal oxides.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610491
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  • 98
    Digitale Medien
    Digitale Medien
    The Faradaic impedance of the lithium-sulphur dioxide system. A kinetic interpretation (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 537-543 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Impedance measurements have been made on Li/SO2(C) cells containing an acetonitrile-based electrolyte in a range of states from newly assembled to completely discharged. The cell behaviour can be explained if it is assumed that the lithium is an irreversible electrode and that the SO2 electrode is reversible. The nominal exchange current density on the lithium is 0.7 mA cm−2 andα ≃ 0.37 for the cell Li/LiBr(2.35 mol dm−3), CH3CN, S2O 4 2− ¦SO2(6.25 mol dm−3)C
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00614980
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  • 99
    Digitale Medien
    Digitale Medien
    Fusibility study of the magnesium cell electrolyte containing MgCl2, CaCl2, NaCl and KCl (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 501-503 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The four-component magnesium cell electrolyte containing MgCl2, CaCl2, NaCl and KCl has been converted to a quasi-ternary system by keeping the proportion of NaCl and KCl in the mixture equimolecular. The triangular phase diagram has been drawn depicting the fusibility isotherms of the system. It has been possible to obtain complete liquid mixtures at temperatures as low as 400° C by suitably adjusting the proportions of the four components of the molten salt mixture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00614975
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  • 100
    Digitale Medien
    Digitale Medien
    Lithium ion conducting solids for ambient applications (1982)
    Springer
    Journal of applied electrochemistry 12 (1982), S. 533-535 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract A number of pure substances and mixtures have been investigated as possible lithium ion conductors. Of the pure substances investigated LiI · H2O shows promise. However, better characteristics were found for LiI/LiOH · H2O/Al2O3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00614979
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