Thermo-mechanical properties of BaGa<sub>2</sub>GeS(e)<sub>6</sub> nonlinear optical crystals
Ginka Exner, Michael A. Susner, Joel M. Murray, Aleksandar Grigorov, Ryan Siebenaller, Benjamin S. Conner, Emmanuel Rowe, Shekhar Guha, Valentin Petrov
Abstract
We report measurements of the thermo-mechanical properties of two recently developed non-chalcopyrite, trigonal, mid-IR nonlinear optical crystals, BaGa 2 GeS 6 and BaGa 2 GeSe 6 . These include orientation dependent hardness and Young’s modulus, thermal expansion in the 200–430 K temperature range, and thermal conductivity in the 184–473 K temperature range. Covering similar wavelength ranges, these new quaternary compounds appear to be very promising alternatives to the classical ternary chalcopyrites AgGaS 2 and AgGaSe 2 due to the advantageous properties evinced by the thermo-mechanical data.