磷锗锌(ZnGeP2, ZGP)晶体是一种性能十分优异的中红外非线性光学材料。本研究采用自制的双温区管式炉成功合成出高纯ZGP多晶, 单次合成量达到600 g; 采用超微梯度水平冷凝法(0.5~1 ℃/cm)成功生长出55 mm×30 mm×160 mm的大尺寸ZGP单晶; 通过工艺优化、定向、切割、退火、抛光和高能束流辐照等处理工艺, 成功实现大口径(12 mm×12 mm×50 mm)ZGP晶体器件制备, 器件在2.09 μm的吸收系数仅为0.03 cm-1, 可以用于大能量和高平均功率红外激光输出。

Zinc germanium phosphide (ZnGeP2, ZGP) crystal is an excellent mid-infrared nonlinear optical material. In this study, high-pure polycrystalline ZGP was synthesized successfully by using a self-made two-zone tube furnace with the amount of 600 g in one run. A large ZGP single crystal with size of 55 mm×30 mm×160 mm was grown by the horizontal gradient freeze method with ultralow gradient (0.5-1 ℃/cm). The large ZGP crystal devices (12 mm×12 mm×50 mm) with low absorption coefficient of 0.03 cm-1 at 2.09 μm were successfully fabricated after orienting, cutting, post-growth thermal annealing, polishing, and high energy beam irradiation. The crystal devices are used for high energy and high average power infrared laser output.