The thermal conductivity and thermal-expansion and thermo-optic coefficients, the knowledge of which is essential for nonlinear optical applications, are measured along the three crystallographic axes of the newly discovered orthorhombic crystal LiInSe2. The latter has a nonlinear susceptibility only a quarter lower than that for the commercially available AgGaS2, but its advantages include 4 times higher thermal conductivity, 2 times lower thermo-optic coefficients, and the lack of sign inversion in thermal-expansion coefficients.

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