Abstract
Reduced equations of motion, which generalize the Bloch–Maxwell equations to polarizable fluids with intermolecular interactions, are derived. Local-field effects are analyzed using the solvable limiting case of a perfect crystal. The dielectric function ∊(k, ω) and the nonlinear susceptibility χ(3) are explicitly evaluated for a model system. Two four-wave mixing techniques, which provide a direct probe for transport processes, are analyzed: the transient grating and its frequency-domain analog. A unified picture is provided for transport phenomena, cascading, and polariton effects.
© 1988 Optical Society of America
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