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Soviet Journal of Quantum Electronics

Control of the spatial structure of radiation formed by reflection from a four-wave mirror

Alexander A. Betin, Alexander A. Shilov

Published Sep 30, 1982• 0 citations
Publisher

Abstract

An experimental investigation was made of the feasibility of controlling the spatial structure of a wave formed by four-wave reversal of the wavefront with the aid of modulation of the field amplitude or phase in a transverse cross section of one of the pump beams. It was found that the effect can be used to transmit data or images across inhomogeneous media.

DOI
10.1070/qe1982v012n09abeh005984

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An experimental investigation was made of the feasibility of controlling the spatial structure of a wave formed by four-wave reversal of the wavefront with the aid of modulation of the field amplitude or phase in a transverse cross section of one of the pump beams. It was found that the effect can be used to transmit data or images across inhomogeneous media.
A theoretical analysis is made of wavefront reversal which is not sensitive to the optical quality of the nonlinear wavefront-reversing medium when complex-conjugate reference waves are formed spontaneously. An investigation is made of the linear and nonlinear stages of reversed wave generation in various nonlinear media using feedback in degenerate and nondegenerate four-wave interaction. It is shown that in nonamplifying nonlinear media this method can only be achieved by additional amplification of the radiation reflected from the nonlinear medium.
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.
An analysis is made of the theory of four-wave wavefront reversal allowing for linear absorption and reflection of all the interacting waves from a mirror which forms a second reference wave from the first incident wave. The Born approximation is used to find the optimum thickness of the nonlinear medium giving the maximum reversal coefficient. Conditions for parametric four-wave oscillation with an arbitrary frequency shift are determined and the dependence of the threshold intensity of the incident reference wave on the linear reflection coefficient of the wave-forming mirror is found for a given thickness of the medium in the absence of absorption.
A wavefront reversal system is proposed for high-power optical radiation. This system is based on a resonant four-wave interaction without recourse to external pump waves. Stimulated scattering of the wave being reversed in a resonant medium placed inside a resonator creates two opposite pump waves and a parametric interaction between them generates reversed radiation. The efficiency of such self-reversal is comparable with the efficiency of conventional wavefront reversal as a result of a four-wave interaction in nonresonant media with a phase nonlinearity and it may reach 10 −3 .