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Ferroelectric tin hypothiodiphosphate (Sn2P2S6) crystals are well-known for their significant piezoelectric, electro-optic, and nonlinear optical properties. These crystals have usually been grown by a vapor transport technique. We report in this paper on the first study of photorefractive nonlinearity in Sn2P2S6 crystals grown by the Bridgman method. Pronounced photorefraction is observed in the near-infrared region of the spectrum even with no preliminary optical sensitizing.


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Funding notes: Financial support from the European Office of Research and Development (EOARD) via the Science and Technology Center of Ukraine (STCU Grant Nos. P585a and P438b) is gratefully acknowledged. In part, this study was supported by the National Academy of Sciences of Ukraine within the project “New photo and electrophysical effects in linear and nonlinear interaction of optical radiation with matter.”

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Journal of Applied Physics