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  • Articles  (16,332)
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  • 1975-1979  (14,095)
  • 1935-1939  (2,237)
  • Electrical Engineering, Measurement and Control Technology  (16,332)
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  • Articles  (16,332)
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  • 1
    Electronic Resource
    Electronic Resource
    Tunnelling rays in graded-index fibres (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 83-93 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An analysis of the role of tunnelling rays in pulse propagation in graded-index fibres is presented. Tunnelling ray attenuation is handled by using the generalized parameter technique which allows attenuation coefficients to be dispensed with and relevant families of tunnelling rays to be identified. Results are given for impulse response pulse widths and shapes. Incorporation of tunnelling ray pulse contributions into the formalism for determining optimum refractive-index profiles is presented. For most cases, tunnelling ray effects are small, but significant corrections may be necessary when measurements are made on short lengths of fibre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620245
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  • 2
    Electronic Resource
    Electronic Resource
    Efficient fifth order non-linear process by focused beam in metal vapour (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 131-138 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Fifth order non-linear processes produced by a focused beam in metal vapour have been investigated experimentally. Evidence of saturation of fifth harmonic generation by picosecond laser pulses is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620004
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of power coupling between multimode optical fibres (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 107-117 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In this paper power coupling between two multimode optical fibres is investigated. A formalism (based on a geometrical approach) suitable for analysing any coupling configuration between fibres with any index profile and any radiance distribution is presented. The model is applied to obtain coupling losses both in uniformly excited parabolic- and step-index fibres, in the presence of all kinds of coupling errors. Numerical results of extensive utility are shown and useful asymptotic expressions of coupling efficiency, valid for small values of coupling error parameters, are derived together with some practical rules for error combination. Mention is also made of some experimental results we have obtained, which corroborate some previous assertions. The work can supply a useful tool in the design of joints and connectors between single fibres or optical cables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620002
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalous polarization dependence of the photon drag and optical rectification fields inn-type gallium phosphide (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 153-161 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The photon drag and optical rectification response fromn-type gallium phosphide containing 2.4×1016 electrons cm−3 has been studied using laser sources at 10.61 and 2.83μm. By using different contact configurations, the existence of an additional electric field term in the propagation direction has been deduced. This field is shown to arise from the spatial derivatives of the photon drag and optical rectification field components caused by absorption of the radiation. The importance of this effect in detector design is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620006
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  • 5
    Electronic Resource
    Electronic Resource
    Diffraction efficiency of sequentially stored gratings in reflection volume holograms (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 171-178 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract On the basis of the theory of coupled waves the amplitudes of the first-order diffracted waves and the diffraction efficiency is calculated for sequentially superposed phase gratings stored in dielectric reflection holograms. The investigations are restricted to the case of a fixed reference wave during recording and Bragg-angle incidence. By analogy to the transmission volume grating the coupling effects which appear between incident beams and diffracted waves give the possibility of building up beam-couplers and -splitters with certain coupling parameters determined by the recording process. Moreover, reflection gratings allow a favourable combination between coupling and reflecting properties and avoid the diffraction efficiency oscillations that are characteristic of transmission gratings. The performance of the reconstruction process with several waves simultaneously allows the tuning of the intensities of diffracted waves with dependence on amplitude or phase differences between incident beams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620008
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  • 6
    Electronic Resource
    Electronic Resource
    Reversible mirror for real-time holographic interferometry (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 181-183 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620010
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  • 7
    Electronic Resource
    Electronic Resource
    Calculation and optimization of parameters of radiating distributed feedback structures (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 11-22 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A simple method is suggested for calculation of reflection, radiation and transmission coefficients for the distributed feedback structure in the second diffraction order. The method is based on a slight difference between coefficients of reflectionR and radiationI of the surface wave for λ=λ∞ (where λ∞ is the light wavelength corresponding to a precise resonance for the grating length I→∞) and those for λ=λl (where λl is the light wavelength corresponding to the resonance for the finite grating length). The simplicity of the method makes it possible to use it for optimization of the distributed feedback structure by a number of parameters. The technique can be used in the case of thin-film and diffused waveguides for both TE and TM modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624054
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  • 8
    Electronic Resource
    Electronic Resource
    Curvature and microbending losses in single-mode optical fibres (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 43-59 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Curvature of a single-mode optical fibre gives rise to two principal forms of additional transmission loss, namely transition loss and pure bend loss. The transition loss and the associated ray radiation, which have been observed at the beginning of a bend, can be satisfactorily explained by a modified coupled-mode theory. The radiation modes are represented by a quasi-guided mode having an average propagation constantβ e. The introduction of a gradual change of curvature reduces the transition loss much more than the pure bend loss. Analysis of the microbending loss shows that the transition component is a maximum at a given correlation length which can be simply expressed in terms ofβ e. The contributions of both transition and bend components to the total microbend loss have been derived for the case of a randomly-curved fibre for several autocorrelation and density functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624057
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependent characteristics of a PIN avalanche photodiode (APD) in Ge, Si and GaAs (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 109-117 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A theoretical assessment is presented based on a modification of Baraff's theory in order to compare the temperature dependence of several characteristics, including breakdown voltage, excess noise factor, effective ionization rate ratio and efficiency in Ge, Si and GaAs PIN avalanche photodiodes. The temperature coefficient of avalanche breakdown voltage in a high field region is studied. Finally the response time of a PIN APD in these materials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624389
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  • 10
    Electronic Resource
    Electronic Resource
    On the role of SRS in the transmission of intense laser light through silica-fibre light-guides (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 141-146 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transmission of high power laser radiation through optical fibres is limited by the onset of stimulated Raman scattering (SRS). The possibility of improved transmission through the use of selective doping is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624392
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