Abstract
Enhanced photorefractive properties of tin hypothiodiphosphate crystals as a result of Bi doping are presented. These new crystals were obtained by the vapor-transport technique using stoichiometric composition with an additional amount of Bi up to in the initial compound. The bandgap edges of the obtained crystals are located at and shift toward the red wavelengths with increasing Bi concentration. crystals are found to exhibit larger two-beam coupling gain coefficients (up to at a wavelength of ) as compared to (i) pure ( at ), (ii) crystals modified by the growth conditions ( at ), and (iii) Te-doped ( at ). At the same time, for an intensity of at , buildup times of 0.9 and at grating spacings of and , respectively, are found; Bi-doped crystals are the fastest among all the presently known crystals operating at near-infrared wavelengths.
© 2008 Optical Society of America
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