Abstract
The Sn2P2S6 crystals are photorefractive materials suitable for red and near infra-red spectral range. Photorefractive properties of the Sn2P2S6 crystals are improved by growth conditions (change of the transport agent). Such modified samples exhibit significantly increased two-beam gain coefficient. Some of the microscopic parameters responsible for the photorefraction (Debye screening length, diffusion length, effective electrooptic coefficients etc.) were evaluated. The accompanied photorefractive scattering effects are also studied.
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