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Measurement of the space-charge field in photorefractive crystals under external field

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Transformation of the small phase modulation (rapidly varying in time) into the intensity modulation during two-wave mixing in photorefractive crystals is applied for measurements of the space-charge-field amplitude created in such cubic crystals as Bi12TiO20, and GaP. Measurements were carried out at different recording mechanisms: under DC-external field and under alternating field of the square-wave form. The theory of the vectorial wave coupling is used to interpret the measured results.

© 2001 Optical Society of America

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