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Soviet Journal of Quantum Electronics

Formation of pulses in stimulated scattering of light in extended media. Modulation of the intensities of transmitted and backscattered radiations

N. F. Andreev, Viktor I. Bespalov, A. M. Kiselev, A. M. Kubarev, Guerman A. Pasmanik

Published Oct 31, 1976• 9 citations
Publisher

Abstract

It is shown experimentally that stimulated backscattering modulates the amplitude of the radiation transmitted by a nonlinear medium and the modulation period is of the order of twice the transit time of light across the scattering region. The depth of modulation decreases from the beginning to the end of a pulse. The experimental results are in agreement with theoretical estimates.

DOI
10.1070/qe1976v006n10abeh011945

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Soviet Journal of Quantum Electronics•Jul 31, 1975•0 citations
It is shown experimentally that stimulated backscattering modulates the amplitude of the radiation transmitted by a nonlinear medium and the modulation period is of the order of twice the transit time of light across the scattering region. The depth of modulation decreases from the beginning to the end of a pulse. The experimental results are in agreement with theoretical estimates.
A calculation is made of the intensity of the Stokes radiation in the stimulated Raman scattering of ultrashort light pulses in a dispersive medium employing the asymptotic approximation for arbitrary modulation of the amplitude and phase of the pump pulse. Particular attention was paid to the effect of phase modulation on the stimulated Raman scattering. Calculations were also made of the intensity of the anti-Stokes component in the scattering of an ultrashort pulse in a dispersive medium and of the optimal angle for the observation of the anti-Stokes rings.
A model of energy transfer by nearly degenerate two-beam coupling in media exhibiting two-photon and excited state absorption is presented and discussed. The two beams include an incident laser, which has a nonlinear time dependent phase, and an elastically backscattered wave derived from the incident laser. Superposition of these two waves creates an index modulation, arising from a spatially modulated, two-photon-created excited-state population, which couples the forward and backward propagating waves. Reflectance of the stimulated wave and transmittance of the incident laser are computed, including the effects of two-photon absorption andexcited state absorption as well as energy transfer between the two beams, and the relevance of the results to experimental measurements is discussed. The backscattered wave has a frequency that is unshifted with respect to that of the incident laser, and the small signal gain is proportional to the square of the incident laser intensity. The different effects due tomultimode and chirped waves are also discussed.
A theoretical analysis is made of the self-diffraction of short light pulses in an induced amplitude-phase grating in a thin layer of resonant medium. Expressions describing the amplitudes (intensities) of the diffracted beams are derived and analyzed. It is shown that the nature of the amplitude modulation of the light diffracted into small angles depends strongly on the amplitudes of the input pulses. It is demonstrated that transient self-diffraction of short pulses can be used in estimating the dipole moment of a saturable transition.