Pump grating-modulation effects in liquid suspensions of microspheres

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Abstract
Degenerate four-wave mixing is examined for arbitrarily strong pump field interactions using a liquid suspension of Brownian microparticles as the active medium. It is shown that pump-generated interactions act to modulate the field-induced translational particle gratings in a novel way which greatly modifies both the steady-state and the transient properties of such media. Of particular interest is the fact that four-wave mixing in suspensions is radically different for the case of an attractive versus repulsive electrostrictive coupling between the microparticles and the pump radiation.