Abstract

Enhanced photorefractive properties of tin hypothiodiphosphate (Sn2P2S6) crystals as a result of Bi doping are presented. These new crystals were obtained by the vapor-transport technique using stoichiometric Sn2P2S6 composition with an additional amount of Bi up to 0.5mol.% in the initial compound. The bandgap edges of the obtained crystals are located at 750nm and shift toward the red wavelengths with increasing Bi concentration. Sn2P2S6:Bi crystals are found to exhibit larger two-beam coupling gain coefficients (up to 17cm1 at a wavelength of 854nm) as compared to (i) pure Sn2P2S6 (2.5cm1 at 854nm), (ii) Sn2P2S6 crystals modified by the growth conditions (14cm1 at 860nm), and (iii) Te-doped Sn2P2S6 (8cm1 at 860nm). At the same time, for an intensity of 1.3Wcm2 at 854nm, buildup times of 0.9 and 2.5ms at grating spacings of Λ=9.8 and 1.3μm, respectively, are found; Bi-doped Sn2P2S6 crystals are the fastest among all the presently known Sn2P2S6 crystals operating at near-infrared wavelengths.

© 2008 Optical Society of America

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