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Recent developments, both theoretical and experimental, involving the nonlinear interactions of light in photorefractive crystals are reviewed. When pumped by light beams in various configurations, certain crystals, such as barium titanate (BaTiO/sub 3/), respond with the self-build up of gratings in the crystal and formation of new light beams. The emphasis here is on these devices, known as photorefractive oscillators, the mutual light-crystal interactions which govern their operation, and all-optical applications which are based on these oscillators.>
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Fischer et al. (1989) studied this question.
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