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Scaling characteristics for phase conjugation in microparticle suspensions

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Abstract

Recently, we explained phase conjugation via degenerate four-wave mixing in liquid suspensions of microparticles in the small field limit, where saturation effects can be ignored.1·2 For these media, electrostrictive forces and torques translate and rotate the particles in such a way as to create two sets of orthogonal translational and orientational spatial gratings. Coherent scattering of pump radiation off of these gratings gives rise to the formation of a conjugate wave as well as amplification of the probe radiation. These studies suggest that due to their large nonlinear susceptibilities, small losses, and reasonable response times, such microparticle suspensions are promising candidates for generating phase-conjugate radiation in high-power laser applications. An issue of particular relevance to these studies is the scaling characteristics of microparticle suspensions with pump intensity. Here we examine the dependence of the four-wave mixing coefficient on the pump intensity for cryogenic suspensions of spherical and ellipsoidal microparticles at infrared wavelengths and find novel saturation effects which we summarize below.

© 1986 Optical Society of America

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