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Journal of Nonlinear Optical Physics & Materials

High Reflectivity Phase Conjugation in the Visible Spectrum using Stimulated Brillouin Scattering in Alkanes

D. C. Jones, Gary Cook, Kevin D. Ridley, A. M. Scott

Published Sep 1, 1998• 2 citations
Publisher

Abstract

High reflectivity optical phase conjugation in the visible spectrum has been achieved using Brillouin-induced four-wave mixing and a scheme based on a Brillouin preamplifier. Four-wave mixing gave the highest fidelity, but the Brillouin preamplifier method had higher reflection coefficients reaching 7×107. This increased to 1010 using an additional dye laser preamplifier.

DOI
10.1142/s0218863598000260

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High reflectivity optical phase conjugation in the visible spectrum has been achieved using Brillouin-induced four-wave mixing and a scheme based on a Brillouin preamplifier. Four-wave mixing gave the highest fidelity, but the Brillouin preamplifier method had higher reflection coefficients reaching 7×107. This increased to 1010 using an additional dye laser preamplifier.
The results of an experimental investigation of a new geometry for producing phase conjugation by Brillouin-enhanced four-wave mixing are presented. In this geometry, the four-wave mixing medium is carbon disulfide, and the backward-going pump wave is created from the transmitted forward-going pump wave by stimulated Brillouin scattering (SBS) in glycerol. The two pump waves are hence phase conjugates of each other, and the quality of the phase-conjugation process is not degraded even by the use of an aberrated pump wave. The probe wave is created by SBS in carbon disulfide, which has a Brillouin frequency half that of glycerol, and the conjugate wave is therefore generated at the same frequency as the probe. Since the pump and signal waves differ in frequency by the Brillouin frequency of the carbon disulfide four-wave mixing medium, high reflectivities (approximately 2000%) are obtained as a result of Brillouin resonance enhancement.
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.