Pressure-Assisted Method for the Preparations of High-Quality AaGaS and AgGaGeS Crystals for Mid-Infrared Laser Applications.

Recently developed chalcogenides nonlinear optical crystals have potential application in mid- to far-infrared laser fields. However, high-quality single crystals are hard to be prepared because of high vapor pressure of sulfur component and decomposition of chalcogenides during the polycrystalline synthesis and single-crystal growth. A pressure-assisted technique was performed to prepare stoichiometric AgGaS and AgGaGeS polycrystalline materials.