A photorefractive effect which results from the spatial separation of electrons and holes in compositionally graded semiconductors is demonstrated for the first time. Unlike conventional photorefractive effects, this nonlinear optical phenomenon requires only a single illumination beam, does not rely on the presence of traps, and is intrinsically very fast. The time evolution of the formation and decay of the space-charge electric field is measured via the electro-optic effect using picosecond pump and probe techniques.
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Ralph et al. (1989) studied this question.
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