Sn2P2S6 is a fast responding photorefractive ferroelectric material with very attractive properties for applications in the near infrared. It exhibits high electro-optic coefficients up to r T 111 = 174pm/V at 633nm and room temperature, large transparency range in the infrared (530–8000 nm), and a high photorefractive sensitivity. We show that modifying the growth conditions and doping with Te can efficiently improve the photorefractive properties of Sn2P2S6. Photorefractive two-beam coupling gain at 860 nm increases from about 2 cm-1 in conventional " yellow" Sn2P2S6 to about 7 cm-1 in Te-doped samples and 14 cm-1 in modified " brown" samples. We demonstrate self-pumped phase conjugating reflectivities above 50 % and rise time of about 50 ms for 2.5 W/cm2 pump intensity at 860 nm.
© 2005 Optical Society of America
P. Günter, D. Haertle, T. Bach, M. Jazbinšek, G. Montemezzani, A. A. Grabar, I. M. Stoika, and Y. M. Vysochanskii, "Sn2P2S6 for near-infrared photorefractive applications," in Photorefractive Effects, Materials, and Devices, G. Zhang, D. Kip, D. Nolte, and J. Xu, eds., Vol. 99 of OSA Trends in Optics and Photonics (Optical Society of America, 2005), paper 2.
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