红外非线性晶体GaSe的合成、生长与性能

Investigation of the infrared nonlinear crystal material GaSe

针对高品质红外非线性晶体GaSe难以生长、加工的问题，研究了垂直布里奇曼法籽晶定向生长技术。制备出Ф20mm×50mm完整单晶，探索了加工工艺，对样品进行了粉末衍射，能谱等测试，晶体在1．06～15μm波段吸收系数约为0．05～0．16cm^-1，完整性、光学质量均较好。演示了9．3～10．6μm波段的CO2激光倍频实验，输出4．65～5．3μm对应倍频光。

Aiming at the problem of growth and treating of large high quality GaSe infrared crystal, the seed aided ver- tical Bridgman technique and ＂puck＂ cutting method are studied. Finally, boule size of GaSe crystal with 20mm in di- ameter and 50mm in length is obtained;some samples are prepared under different directions. There are characterized with X-ray diffraction,EDS spectrum and so on. Absorption coefficient about 0. 05 -0. 16cm ^-1in the range 1.06 - 15 μm is achieved. Frequency doubling from 9.3 - 10.6 l,m to 4.65 - 5.3 μm for a TEA CO2 laser is demonstrated. But how to avoid the deformation of crystals under this cure technique for direct phase matching experiments is still a big challenge.