Potentials of LiGa(S1−xSex)2 mixed crystals for optical frequency conversion

Abstract Phase-matching conditions are considered for second harmonic generation (SHG) and optical parametric generation in LiGa(S 1− x Se x ) 2 mixed crystals as a function of chemical composition under the supposition of linear dependence of refractive indices on x . It has been shown that by tuning x over the range 0–1 the SHG can be realized in XY plane for λ = 2.1 – 7.8 μ m pumping at ϕ = 43 – 90 ° , in YZ plane for λ = 2.1 – 2.2 and 4.8–7.8 μm pumping at θ = 0 – 90 ° , and in XZ plane for λ = 1.6 – 11.7 μ m pumping at θ = 0 – 57 ° . The LiGa(S 1− x Se x ) 2 solid solutions are also attractive for design of tunable femtosecond pulse frequency converters with saving of pump pulse duration.

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