Linear and nonlinear optical properties of some ternary selenides

The refractive indices of the ternary A^{I}B^{III}C_{2}^{VI} semiconductors CuAlSe 2 , AgGaSe 2 , CuGaSe 2 , and AgInSe 2 have been measured over most of the transparency range of these crystals. The optical nonlinear coefficients for second-harmonic generation of AgGaSe 2 CuGaSe 2 , and AgInSe 2 have also been measured. Three-frequency colinear phase matching is analyzed in detail for AgGaSe 2 . The birefringences of the other three crystals are not sufficient to permit three-frequency colinear phase matching within the range of the measured index. The merits of AgGaSe 2 for nonlinear optical applications are evaluated in comparison with other promising infrared nonlinear materials.

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