Interband photorefraction in Sn2P2S6 at visible wavelengths

摘要

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 514 am show grating response times of around 100 mu s at moderate light intensities of 0.6 W/cm(2), 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 Gamma = 60 +/- 8 cm(-1) is measured, and holes are identified as dominant charge carriers for the interband photorefractive effect. (c) 2006 Optical Society of America.