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Measuring photorefractive trap density without the electro-optic effect

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Abstract

Two optical beams can couple in a photorefractive crystal without using the electro-optic effect. Beam coupling is due to a spatially modulated absorption caused by the rearrangement of trapped charges. We use these gratings to determine the effective photorefractive trap density for several barium titanate crystals.

© 1990 Optical Society of America

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