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Soviet Journal of Quantum Electronics

Quality of wavefront reversal of multifrequency radiation by four-wave interaction

A. I. Erokhin, Valeri I. Kovalev, П. А. Михеев, F S Faĭzullov

Published Jan 31, 1985• 1 citation
Publisher

Abstract

It is shown experimentally that broadening of the frequency spectrum of waves participating in four-wave interaction in a system with exactly counterpropagating reference waves results in an angular spread of the reflected radiation and thus causes a deterioration in the wavefront reversal quality. The angular spread is proportional to the angle of convergence of the signal and the parallel pump wave and to the width of the emission spectrum.

DOI
10.1070/qe1985v015n01abeh005879

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It is shown experimentally that broadening of the frequency spectrum of waves participating in four-wave interaction in a system with exactly counterpropagating reference waves results in an angular spread of the reflected radiation and thus causes a deterioration in the wavefront reversal quality. The angular spread is proportional to the angle of convergence of the signal and the parallel pump wave and to the width of the emission spectrum.
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.
An investigation is made of the reflection of a mulitfrequency signal in connection with wavefront reversal in four-wave interaction. When the signal and reference waves are generated by a single source and their optical paths are matched, it has been established experimentally and theoretically that if the length of the medium is greater than the coherence length, the reflection efficiency is the same as that for monochromatic waves of the same intensity. For a short medium, fluctuations of the intensity of many nonphase-matched spectral components should increase the reflection efficiency up to sixfold.
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.