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Acta Optica Sinica

A SBS amplifier in phase conjugation by FWM

W Chen

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

A method of producing a phase-conjugate wave is presented which has the qirtues of both four-wave-mixing and stimulated Brillouin scattering. A high-vuality phase-conjugate wave with a conversion efficiency of greater than unity was obtained.

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IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)•Nov 19, 2002•0 citations
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Brillouin enhanced four-wave mixing (BEFWM) is a judicious combination of SBS and FWM processes. In the traditional BEFWM experiments, two cells are used: one generates SBS, the other provides four-wave mixing. We demonstrated the generation of a phase conjugate signal by single cell BEFWM with focusing geometry. A single cell containing the optical nonlinear medium was used simultaneously for conventional SBS and FWM. Experiments were performed by using either CS2 or TiCl4 as the nonlinear medium; both have large Brillouin gain but differ greatly in their nonlinear indices of refraction. Thus the mechanism for four-wave mixing is shown to be Brillouin nonlinearity. In this experiment, the phase matching condition was satisfied and the frequency of the phase conjugate signal was not shifted from that of the master input beam. The operating regime of the experiment was far below the threshold of instability, which accounts for the low reflectivity that we observed. This single cell configuration is more compact and the optical alignment is easier than in the conventional BEFWM, in which two nonlinear cells are used.