Growth and characterization of ZnGeP2 single crystals by the modified Bridgman method

Growth and thermal annealing effect on infrared transmittance of ZnGeP2 single crystal

“…It is widely used for OPO due to its unique set of optical properties, including wide potential transmission range (0.7-12 mm), large nonlinear coefficient (d 36 ¼75 pm/V) and high thermal conductivity (0.35 W cm À 1 K À 1 ) [1]. The main method to prepare ZnGeP 2 single crystal is melt directional solidification such as vertical Bridgman (VB) method [2], vertical gradient freezing (VGF) method [3] and horizontal gradient freezing (HGF) method [4]. However, it is still not easy to prepare high quality ZnGeP 2 single crystals due to the existence of micro-crack induced by anisotropic thermal expansion and point defects such as vacancies of volatile components that lead to the deviation in stoichiometry [5].…”

Growth and annealing characterization of ZnGeP2 crystal

“…[15]. At present, the most popular ZGP growth techniques are the VB and HGF methods [11,[16][17][18][19]. The high-quality ZGP crystals were grown by these methods and the optical absorption coefficient at 2.06 mm decreased to be 0.02 cm À 1 [17][18][19].…”

Annealing and optical homogeneity of large ZnGeP2 single crystal

“…The ampoule was placed in the middle of a two-temperature horizontal furnace to synthesize the ZGP polycrystals [15]. About 160 g of ZGP polycrystals was loaded in a specially designed quartz growth ampoule, and then the ampoule was evacuated and sealed.…”