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Interband photorefraction in Sn 2 P 2 S 6 at visible wavelengths

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Abstract

Continuous-wave photorefractive experiments in Sn2P2S6 crystals and interband photorefraction at the visible wavelengths of 514 and 488nm are presented. Two-wave mixing and Bragg diffraction measurements at 514nm show grating response times of around 100μs at moderate light intensities of 0.6Wcm2, i.e., 2 orders of magnitude faster than measured in the same crystal in the conventional photorefractive regime. A large two-wave mixing gain of up to Γ=60±8cm1 is measured, and holes are identified as dominant charge carriers for the interband photorefractive effect.

© 2006 Optical Society of America

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