Abstract
The intensity-dependent two-wave mixing gain at large modulation depth is measured in a BaTiO 3 crystal. We derive an expression of nonlinear space-charge field from Kukhtarev's materials equations for single charge carrier without assuming the linear recombination of free charge carriers. The experimental results are interpreted by taking into account both an empirical correction function at large modulation depth [Refregier et al., J. Appl. Phys. 58 (1985) 45] and intensity-dependent factor of the space-charge field, which is caused by nonlinear recombinations of free charge carriers.
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