Linear optical properties of LiIn(S1-xSex)2 crystals and tuning of phase matching conditions

LiInSe2 and mixed LiIn(S0.5Se0.5)2 crystals have been grown by vertical Bridgman-Stockbarger method. Optical properties of deep red LiInSe2 and orange LiIn(S0.5Se0.5)2 crystals have been evaluated. The dispersion of refractive indices has been measured and the Sellmeier coefficients have been calculated for LiInSe2 and LiIn(S0.5Se0.5)2 crystals. Linear dependence of the refractive indices on Se/(S + Se) ratio has been found in LiIn(S1-xSex)2 compounds. The ranges of phase matching possible in LiIn(S1-xSex)2 solid solutions for main crystal planes have been calculated with using Sellmeier equations specified for the compounds.