Continuous-wave photorefractive experiments in Sn<sub>2</sub>P<sub>2</sub>S<sub>6</sub> crystals and interband photorefraction at the visible wavelengths of 514 and 488 nm are presented. Two-wave mixing and Bragg diffraction measurements at 514 nm show grating response times of around 100 μs at moderate light intensities of 0.6 W/cm<sup>2</sup>, 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±8 cm<sup>−1</sup> is measured, and holes are identified as dominant charge carriers for the interband photorefractive effect.
© 2006 Optical Society of America
Original Manuscript: January 1, 2003
Revised Manuscript: March 22, 2003
Manuscript Accepted: March 22, 2006
Roger Mosimann, Daniel Haertle, Mojca Jazbinsek, Germano Montemezzani, and Peter Günter, "Interband photorefraction in Sn2P2S6 at visible wavelengths," J. Opt. Soc. Am. B 23, 1620-1625 (2006)