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Article Dans Une Revue Optical Society of America Année : 2008

Enhanced photorefractive properties of Bi-doped Sn2P2S6

Résumé

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 0.5 mol. % in the initial compound. The bandgap edges of the obtained crystals are located at ~750 nm 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 17 cm−1 at a wavelength of 854 nm) as compared to (i) pure Sn2P2S6 (2.5 cm−1 at 854 nm), (ii) Sn2P2S6 crystals modified by the growth conditions (14 cm−1 at 860 nm), and (iii) Te-doped Sn2P2S6 (8 cm−1 at 860 nm). At the same time, for an intensity of 1.3 W/cm2 at 854 nm, buildup times of 0.9 and 2.5 ms at grating spacings of Λ=9.8 and 1.3 μm, respectively, are found; Bi-doped Sn2P2S6 crystals are the fastest among all the presently known Sn2P2S6 crystals operating at near-infrared wavelengths.
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Dates et versions

hal-00405788 , version 1 (21-07-2009)

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Ihor V Kedyk, Pierre Mathey, Grégory Gadret, Olivier Bidault, Alexander A Grabar, et al.. Enhanced photorefractive properties of Bi-doped Sn2P2S6. Optical Society of America, 2008, 25 (2), pp.180-186. ⟨10.1364/JOSAB.25.000180⟩. ⟨hal-00405788⟩
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