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Measurements of stimulated Brillouin scattering phase conjugate fidelity

Paul Suni, Joel Falk

Published Apr 26, 1987• 0 citations
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Abstract

We describe high-accuracy measurements of stimulated Brillouin scattering phase-conjugate fidelity. The dependence of fidelity on pump intensity and on pump-beam divergence is in rough agreement with theoretical predictions for the low-reflectivity limit, even for operation deep into the saturation regime.

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We have measured the reflectivity and phase-conjugate fidelity of stimulated Brillouin scattering in hexane while varying the pump power and aberration. By directly measuring the reduction in focal intensity that is due to aberrations, we found that the reflectivity and the fidelity depend solely on the focal intensity. We were able to vary the strength of aberration, producing up to a factor-of-30 reduction in focal intensity. The reflectivity and fidelity decreased monotonically with decreasing focal intensity. There was no minimum amount of aberration required for accurate wave-front reversal, and the maximum amount was the aberration that reduced intensity to near threshold.
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.