Abstract

Measurements of optical phase-conjugation signals by degenerate four-wave mixing in an isotropic Kerr-like suspension of polystyrene spheres are reported. Polarization discrimination through orthogonally polarized pump beams was used to measure separately the coarse-grating and the fine-grating contributions. Autocorrelation techniques permitted measurement at low power levels. The coarse-grating contribution to χ⁽³⁾ for a suspension of 0.05-μm-diameter polystyrene spheres in water yielded an effective χ⁽³⁾ = 2.4 × 10⁻¹⁵ (m/V)², in good agreement with theory, whereas the fine-grating contribution for the same solution yielded χ⁽³⁾ = 0.56 × 10⁻¹⁵ (m/V)², a value 10 times smaller than predicted by theory. Limitations of the theory are discussed.

© 1988 Optical Society of America

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