Thermal properties of the midinfrared nonlinear crystal LiInSe2

Abstract

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.

Ternary chalcogenides LiBC2 (B=In,Ga; C=S,Se,Te) for mid-IR nonlinear optics

“…Table 1 summarizes our refined Sellmeier fits for computation of the refractive index. Other experiments aimed at determining the thermo-mechanical properties (thermal expansion and conductivities, thermo-optical coefficients [6,9]), and surface damage threshold fluence (up to 1 J/cm 2 for LIS, [6]) confirmed the advantages of Li-chalcogenides over the AGS(e) chalcopyrites.…”

“…• Their thermal conductivities are about $5 times larger than those of AGS(e) [6,9], owing to the increase in lattice phonon energy and Debye temperature. At equivalent residual absorption loss, thermal lensing effects should hence be minimized.…”

First-principles study of lattice dynamics and thermodynamic properties of LiInX2 (X=S, Se, Te)

“…At room temperature, the heat capacities are 86.88, 92.30 and 93.89 J/mol K for LiInS 2 , LiInSe 2 and LiInTe 2 , respectively. The calculated C V values of three compounds are compared with the experimental C P values obtained by Yelisseyev and Kuhn [30,31] from Fig. 6(d).…”

Optical, thermal, electrical, damage, and phase-matching properties of lithium selenoindate

“…Heat capacity measurements were performed with a differential scanning calorimeter DSC-204 Netzsch in the temperature range of 113-483 K. A single crystal of Al 2 O 3 , 66.45 mg in weight, was used for calibration as a reference sample. More details about the experimental procedure can be found in [60].…”