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  • 1990-1994  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Multibeam energy transfer in a Kerr medium (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1450-1455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multibeam coupling in a Kerr medium with a finite response time is studied theoretically. Two different frequency spectra are considered. In the first case the modes are equally spaced and in the second the frequency separations are all unequal. In either case, as the beams propagate, both spectra eventually reach a saturation characterized by a cascading of energy into the lowest frequency if the Kerr constant is positive. The direction of energy transfer is reversed if the Kerr constant is negative. Representative examples are given for a multimode, equally spaced, laser source and for an unequally spaced source. For the former case, we give the optimum medium response time for conversion of a Gaussian spectra. If the frequencies are unequally spaced we present general conditions which have to be satisfied and give two examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346672
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transverse electric field scattering by a Kerr media deposited on a conducting planar surface (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 446-455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The scattering of a transverse electric plane wave incident from a linear media by a nonlinear Kerr film deposited on a good conductor is studied. Self-focusing and self-defocusing are included both above and below the critical angle. The solution to the complex second-order nonlinear differential wave equation is constrained at the nonlinear/conductor planar interface by mixed boundary conditions and at the linear/nonlinear interface by the continuity of the tangential electric and magnetic fields. A potential-well approach is employed to classify and isolate the various solutions. Several examples illustrate the two nonlinear analogies of the evanescent and harmonic field solutions. Additionally, we obtain the surface-wave solutions and the transitional, hybrid, fields. Finally, we show that the reflectivity is multistable with respect to the incident intensity and that the reflected intensity is multistable as the incident angle changes for a constant input intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346814
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Period-doubling route to chaos in a semiconductor laser subject to optical injection (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3539-3541 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental measurements and a single-mode analysis of a quantum-well laser diode subject to strong optical injection are combined to demonstrate that the diode follows a period-doubling route to chaos. All laser parameters used in this model, including the influence of spontaneous emission noise, were experimentally determined based on the four-wave mixing technique. The transition to chaos can be used to reduce the uncertainty in the value of the linewidth enhancement factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111218
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of optical switching phenomena in dense media (1994)
    Springer
    The European physical journal 94 (1994), S. 123-132 
    Details
    ISSN: 1434-6036
    Keywords: 42.65.Pc ; 42.50.Hz ; 42.79.Ta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ultrafast optical switching phenomena in a dense medium of two-level atoms induced by arbitrary varying pulses are explained in terms of the adiabatic cancellation of the pulse by the induced polarization. The final population inversion of the medium after the passage of the pulse is found to depend on the number of oscillations the inversion exhibits during the time interval when the normalized pulse amplitude exceeds the maximum allowed value of the atomic polarization. If the inversion undergoes an integer number of oscillations in this region, then the final state of the system returns to the ground state. On the other hand, if the inversion undergoes a half integer number of oscillations in this region, the final state of the system is fully inverted. This behavior is explored analytically and illustrated numerically for the constant, sine and secant pulse shapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307663
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photoelectret and electrophotographic properties of barium titanate-polyvinylidene fluoride composite film (1991)
    Springer
    Journal of materials science 26 (1991), S. 2671-2676 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Photoferroelectric barium titanate (BaTiO3)-polyvinylidene fluoride (PVDF) composite films in the ratio 70∶30 are found to possess good photosensitivity in the visible region of the spectrum. Results on investigations of charge generation, trapping, recombination, discharge and retention properties of the composite film are presented in this paper. Photoinduced polarization is obtained in a BaTiO3-PVDF composite film by the simultaneous application of a d.c. field and illumination from an argon-ion laser or by white light. The dark (photo) polarization and the dark (photo) depolarization current decay characteristics of the polarized films have been studied under different experimental conditions. The studies show that the composite film retains good polarization for a fairly long time in the dark condition, and the magnitude of the depolarization current is comparable with that of BaTiO3 single crystal. Under illumination, the decay is fast enough to make use of the film for electro-photographic applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545553
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Photoelectret and electrophotographic properties of barium titanate-polyvinylidene fluoride composite film (1991)
    Springer
    Journal of materials science 26 (1991), S. 2671-2676 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Photoferroelectric barium titanate (BaTiO3)-polyvinylidene fluoride (PVDF) composite films in the ratio 70∶30 are found to possess good photosensitivity in the visible region of the spectrum. Results on investigations of charge generation, trapping, recombination, discharge and retention properties of the composite film are presented in this paper. Photoinduced polarization is obtained in a BaTiO3-PVDF composite film by the simultaneous application of a d.c. field and illumination from an argon-ion laser or by white light. The dark (photo) polarization and the dark (photo) depolarization current decay characteristics of the polarized films have been studied under different experimental conditions. The studies show that the composite film retains good polarization for a fairly long time in the dark condition, and the magnitude of the depolarization current is comparable with that of BaTiO3 single crystal. Under illumination, the decay is fast enough to make use of the film for electro-photographic applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387735
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    Paper (German National Licenses)
    Fulltext
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