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  • Articles  (131)
  • Engineering General  (104)
  • 42.10  (27)
  • 1975-1979  (131)
  • Geosciences  (104)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (27)
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  • Articles  (131)
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  • 1
    Electronic Resource
    Electronic Resource
    Time-dependent propagation of high-energy laser beams through the atmosphere: II (1977)
    Springer
    Applied physics 14 (1977), S. 99-115 
    Details
    ISSN: 1432-0630
    Keywords: 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Various factors that can effect thermal blooming in stagnation zone situations are examined, including stagnation-zone motion, longitudinal air motion in the neighborhood of the stagnation zone, and the effects of scenario noncoplanarity. Of these effects, only the last offers reasonable hope of reducing the strong thermal blooming that normally accompanies stagnation zones; in particular, noncoplanarity should benefit multipulse more than cw beams. The methods of treating nonhorizontal winds hydrodynamically for cw and multipulse steady-state sources are discussed. Aspects of pulse “self-blooming” are also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882638
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  • 2
    Electronic Resource
    Electronic Resource
    Statistical properties of the sum of partially-developed, correlated speckle patterns (1978)
    Springer
    Applied physics 17 (1978), S. 159-164 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract General formulas for the average contrast and probability density function of the sum ofN partially-developed, correlated speckle patterns have been theoretically derived. These two parameters characterizing the statistical properties of added speckle patterns have been actually evaluated for the sum of two partially-developed, correlated speckle patterns and shown in figures as a function of the surface roughness of illuminated objects, the wavelength difference of two illuminating lights, and the number of scattering cells within the illuminated area of objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885249
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  • 3
    Electronic Resource
    Electronic Resource
    Singularity expansions for cylinders of finite conductivity (1978)
    Springer
    Applied physics 17 (1978), S. 239-248 
    Details
    ISSN: 1432-0630
    Keywords: 41 ; 42.10 ; 02
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new rigorous differential formulation to compute the scattering matrix of an obliquely oriented cylinder of finite conductivity and arbitrary shape is given. The analytic continuation of the scattering operator is examined in the frequency domain as well as in the propagation constant domain. The corresponding computer program is able to compute the singularity expansion for such a cylinder, as well as the propagating mode along it. Numerical examples are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886952
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  • 4
    Electronic Resource
    Electronic Resource
    Optical birefringence in cubic ZnSe crystals (1976)
    Springer
    Applied physics 11 (1976), S. 383-384 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Optical birefringence of the spatial dispersion type has been observed in cubic ZnSe crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00919368
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization orthogonalization properties of optical systems (1977)
    Springer
    Applied physics 13 (1977), S. 281-285 
    Details
    ISSN: 1432-0630
    Keywords: 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We investigate the conditions under which an optical system (or device) may transform polarization states at its input into orthogonal states at its output. We find that such polarization orthogonalization is possible if the Jones matrix of the optical system satisfies a specific inequality. One, two, or an infinite number of input polarization states may be orthogonalized. In the latter case, the locus of input states is a circle in the complex plane (and on the Poincaré sphere) of polarization. Several examples are given for illustration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882893
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  • 6
    Electronic Resource
    Electronic Resource
    Off-resonance dispersion in molecular double resonance experiments (1977)
    Springer
    Applied physics 13 (1977), S. 271-280 
    Details
    ISSN: 1432-0630
    Keywords: 32.20 ; 42.10 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper analyses effects related to the real part of the gaseous electric susceptibility in microwave-microwave and infrared-microwave double resonance experiments on two transitions with a common level. The most interesting features are obtained when the gaseous refractive index is probed far off resonance, i.e. in the tail of the dispersion characteristic and when the pump frequency is scanned around the resonance: a resonant change of the refractive index for the probe field is observed, the shape of which is that of the saturated pump line. A calculation using a model of strong collisions gives results in good agreement with the experimental ones. Applications of these phenomena to the determination of frequencies and transition matrix elements of infrared lines are discussed in the general case of lack of overlapping of the laser gain profile and of the infrared line. It is proposed to use these dispersion effects to detect Doppler-free infrared two-photon molecular absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882892
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  • 7
    Electronic Resource
    Electronic Resource
    A monostatic inverse scattering model based on polarization utilisation (1976)
    Springer
    Applied physics 11 (1976), S. 337-350 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 84
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The solution of the inverse problem of electromagnetic scattering by smooth, convex shaped, perfectly conducting, 3-dimensional scatterers is analysed. Certain geometrical as well as physical-optics approximations were used to incorporate the concepts of the “Minkowski problem” of differential geometry into the space-time integral solution of electromagnetic scattering to yield the formal solution for the recovery of the surface profile of the scatterer from the scattered field data. Although various efficient solutions for target identification are available, still information contained in polarization-depolarization characteristics of the scatterer is not yet exploited to its full extent. Therefore the underlying assumption in this investigation was based on the fact that the “depolarization characteristics” of the scattered field do necessarily contain information regarding the surface profile of the scatterer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00919362
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  • 8
    Electronic Resource
    Electronic Resource
    Symmetry group and natural resonances for a cylinder of finite conductivity (1979)
    Springer
    Applied physics 18 (1979), S. 291-296 
    Details
    ISSN: 1432-0630
    Keywords: 02 ; 42.10 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The connection of the natural resonances and the symmetry group of the cross-section of the diffracting-cylinders is established. As is done in spectroscopy, selection rules for the propagation directions of the diffracted field are deduced. Some remarks about the case of propagating modes along a dielectric rod are also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885517
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  • 9
    Electronic Resource
    Electronic Resource
    Transient propagation of optical beams in active media (1978)
    Springer
    Applied physics 17 (1978), S. 53-62 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The coherent interaction of short optical pulses with a nonlinear active resonant medium is calculated. The rigorous and self-consistent solution of the coupled nonlinear Maxwell-Bloch equations including transverse and time-dependent phase variations predicts the onset on an on-resonance self-focusing that agrees very well with a previous perturbation treatment and with recent experiments in sodium and neon. The formation of this dynamic self-action effect is elucidated as being due to the combined effects of diffraction and the inertial response of the active media. Accuracy and computational economy are achieved simultaneously by redistributing the computational grid points according to the physical requirements of the problem. Evenly spaced computational grids are related to variable grids in physical space by a range of stretching and rezoning techniques including adaptive rezoning where the coordinate transformation is determined by the actual physical solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885031
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  • 10
    Electronic Resource
    Electronic Resource
    Coherence and the radiation laws (1977)
    Springer
    Applied physics 12 (1977), S. 221-244 
    Details
    ISSN: 1432-0630
    Keywords: 05 ; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A review is presented of various recent investigations on the classical optical radiation laws in the light of the modern concepts of coherence and statistical optics. Temporal coherence of black-body radiation, spatial coherence of Lambertian and non-Lambertian sources, and the interaction of matter with radiation of any state of coherence are emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00915197
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