Temperature Dependence of Photorefractive Response of Sn2P2S6

Shumelyuk A., Ruediger A., Schirmer O.F., Hilling B., Dieckmann V., Brüning H. Schemme T., Imlau M., Odoulov S.

Abstract

The photorefractive response in Sn2P2S6 (SPS) is studied as a function of temperature with two-beam coupling experiments. The temperature dependences of the diffusion field and the electrooptic coefficient are the main reasons for the considerable decrease of the gain factor when cooling the sample from ambient temperature down to 150 K. At temperatures below 150 K, light-induced absorption gratings appear that are responsible for beam coupling, and the sign of the gain factor is dependent on the wavelength of the recording light.