Phase conjugation in liquid suspensions of microellipsoids in the diffusive limit

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Abstract
We examine phase conjugation via degenerate four-wave mixing in liquid suspensions of microellipsoids in the small-field limit, where saturation effects can be ignored. For these media, electro- strictive torques rotate the microellipsoids in such a way that two orthogonal orientational gratings are created. Furthermore, electrostrictive forces modulate the microparticle density, which gives rise to the formation of two orthogonal spatial gratings that are superimposed on the orientational ones. Coherent scattering of pump radiation from these four gratings generates the conjugate wave and, in the low-loss limit, amplifies the probe wave. We discuss the steady-state and transient characteristics of the probe and conjugate waves in this limit where microparticle dynamics are governed by diffusion.