Abstract
By using tunable dye lasers, the third-order optical nonlinear susceptibility χ(3)(−ω3,ω1,ω1−ω2) is studied in LiNbO3. χ(3) shows resonant enhancement when ω1−ω2 is near the polariton frequencies. This behavior is explained in terms of a nonlinear force which drives the polariton modes strongly whenever momentum matching is satisfied.

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