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采用改进的垂直布里奇曼法在自制的三温区炉内生长出尺寸达Ф24 mm×70 mm的磷锗锌(ZnGeP2,ZGP)单晶体,将晶体在600℃下于同成分粉末包裹中进行了500 h退火热处理。采用X射线衍射仪(XRD)、X射线荧光仪(XRF)以及傅里叶红外光谱仪(FTIR)对ZGP晶体结构、成分和光学性能进行了测试和分析表征。加工制作出ZGP光参量振荡器(ZGP-OPO),采用2.1μm、7 kHz激光泵浦ZGP-OPO,实现了3~5μm中红外调谐激光输出,功率达0.48 W。上述结果表明所研制的ZGP晶体结构完整,品质高,能够用于制作非线性光学元器件应用。
An improved vertical Bridgman method was used to grow single crystals of ZnGeP2 (ZGP) up to Ф24 mm × 70 mm in a self-made three-temperature furnace. The crystals were encapsulated in the same composition powder at 600 ℃ 500 h annealing heat treatment. The crystal structure, composition and optical properties of ZGP were characterized and analyzed by XRD, XRF and FTIR. The ZGP-OPO was fabricated and processed. The ZGP-OPO with 2.1μm and 7 kHz laser was used to pump the laser with 3 ~ 5μm mid-infrared. The power reached 0.48W. The above results show that the developed ZGP crystal structure is complete and of high quality and can be used for making nonlinear optical components.