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Annual Meeting Optical Society of America

Efficient phase conjugation by Brillouin-enhanced four-wave mixing

A. M. Scott, M. S. Hazell

Published Jan 1, 1985• 0 citations
Publisher

Abstract

Andreev et al.1 have shown that Brillouin-enhanced four-wave mixing can be used to achieve phase conjugation with high reflectivities (~106). In this paper we develop a theoretical model which effectively describes the four-wave mixing process and compare the results of this model with the experimental results we have obtained.
DOI
10.1364/oam.1985.ths3

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We report on an investigation of Brillouin-enhanced four-wave mixing which provides phase conjugate reflectivities greater than 104. Theoretical modeling shows that the phase conjugate intensity grows with time until limited by pump depletion, and the main effect of varying the signal power is to increase the time delay before the conjugate beam reaches peak intensity. This is confirmed experimentally, and the maximum peak reflectivity is limited by the length of the laser pulses used in the experiment.
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It has previously been shown that Brillouin enhanced four-wave mixing can lead to large phase conjugate reflectivities for moderate laser powers.1,2 However, in the geometry considered by previous workers the pumps have equal frequency and hence the conjugate signal is shifted in frequency with respect to the probe. We have conducted an experimental and theoretical study of Brillouin-enhanced four-wave mixing for the different case in which the two pump waves differ in frequency by twice the Brillouin frequency of the four-wave mixing medium, and in which the probe wave frequency is halfway between those of the pump waves. In this case, the phase conjugate wave has the same frequency as the probe. Reflectivities > 100 % have been measured. Experimental results are compared to those of a theory that includes the effects of phase mismatch, pump depletion, and the finite response time of the medium.