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Soviet Journal of Quantum Electronics

Influence of diffusion of excited particles on wavefront reversal in a gaseous medium

Michail G. Galushkin, Aleksandr M Seregin, A. B. Fedorov, Nikolay V. Cheburkin

Published Oct 31, 1983• 2 citations
Publisher

Abstract

A theoretical investigation is made of the influence of diffusion of excited particles on the parameters of the process of wavefront reversal by a degenerate four-wave interaction in amplitude gratings formed in an inverted carbon dioxide gas. It is shown that the thermal motion of molecules makes the reversal efficiency and the optimal degree of saturation of the gain depend strongly on the direction of propagation of the reversed wave.

DOI
10.1070/qe1983v013n10abeh004937

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Soviet Journal of Quantum Electronics•Feb 28, 1983•0 citations
A theoretical investigation is made of the influence of diffusion of excited particles on the parameters of the process of wavefront reversal by a degenerate four-wave interaction in amplitude gratings formed in an inverted carbon dioxide gas. It is shown that the thermal motion of molecules makes the reversal efficiency and the optimal degree of saturation of the gain depend strongly on the direction of propagation of the reversed wave.
A theoretical investigation is made of the characteristics of wavefront reversal in the course of a degenerate four-wave interaction in moving slow-response media. It is shown that the displacement (by a moving medium) of amplitude and phase gratings, and also diffusion of excited particles may influence greatly the parameters of a reversed wave. The characteristics of a nonlinear mechanism of light-induced heat evolution in thermodynamic-nonequilibrium media are determined for spatially inhomogeneous radiation.
A theoretical analysis is made of the efficiency of wavefront reversal under conditions of a degenerate form of the four-wave interaction in a resonantly absorbing (amplifying) medium allowing for changes in the pump waves as a result of their natural resonant absorption (amplification). The coefficient of reflection into a reversed wave is obtained as a function of the optical thickness of a layer of the medium, the boundary values of the pump wave intensity, and the shift of the field frequency from the line center. The optimal values of these parameters and the corresponding maximum reflection coefficient are determined.
A two-level model is used in a theoretical analysis of wavefront reversal in a degenerate four-wave interaction in dye solutions. The results are valid for an arbitrary profile bearing in mind the mirror symmetry of the absorption and luminescence bands. The influence of the spectral characteristics of the dye and of the parameters of the pump radiation on the energy efficiency of wavefront reversal is discussed. In particular, an asymmetric dependence of the reflection coefficient on the frequency detuning of the degenerate four-wave interaction is indicated.
An investigation is made of wavefront reversal of optical radiation in a nondegenerate four-wave interaction in a resonant medium. It is shown that for a pump intensity comparable with the saturation intensity of the absorption line of the resonant medium, the reversed wave spectrum has two side peaks positioned symmetrically relative to the central peak which corresponds to a degenerate interaction. These side peaks are attributable to regions of negative absorption (amplification) of weak radiation by the resonant medium situated in a high-power field of opposite pump waves. The dependences of the magnitudes and positions of these peaks on the pump intensity can be used to control the spectral and energy characteristics of the reflected radiation. The conditions for self-excitation of a reversing system based on resonant four-wave interaction are determined. In particular, the ranges of the pump intensity and the optical density of the resonant medium in which self-excitation of the reversing system may occur, are determined for a degenerate interaction.