Abstract
The nonlinear optical response of polar materials (ionic crystals and polar semiconductors) is studied. Within the generalized Born-Huang theory, the nonlinear response of a system is found to exhibit a characteristic peak near the polariton resonance. As an example, the transparency of a plate (Fabry-Perot cavity) of a weakly nonlinear polar material is studied. It is shown that the dependence of the output signal intensity on the incident radiation intensity exhibits a bistable behavior for the systems under study.
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