红外非线性晶体材料CdSe具有透光波段宽广,吸收系数低等优点, 在中长波尤其是 8～12μm红外波段的频率转换 方面有广阔的应用前景,目前已引起国外众多科研机构的极大重视。采用高温元素反应法直接合成 CdSe 多晶料, 利用温度梯度熔体区熔法生长出 CdSe 单晶,晶体棒毛坯尺寸达Φ19×70 mm; 通过X射线粉末衍射、感应耦合等离子 体质谱等对多晶原料进行成分分析,原料纯度可达5N; 利用低倍率红外显微镜、红外分光光度计检测了晶体的基本光学性能, 3～20μm波段晶体平均吸收系数α约为0.08 cm-1, 品质良好,已能满足激光实验要求。

The infrared nonlinear crystal CdSe has attracted more attention recently because of its special optical properties, including low optical losses and long wave high tunability efficiency at λ>8μm with non-multi-phonon absorption, making it one of the leading candidates for use as nonlinear optics devices for frequency conversion, especially 8～12μm. CdSe polymaterial was gained by element reaction directly at high temperature, then single crystal was grown with temperature gradient solution zoning (TGSZ) method, and crystal with 19 mm in diameter and 70 mm in length was obtained. The polymaterials were studied by X-ray power diffraction (XRD) and ICP-MS methods to check the purity, and the single crystal slices were investigated by infrared microscope and spectrophotometer,which showed that the absorption coefficient α is about 0.08 cm-1 among 3～20μm, so it can be used as elements in some laser experiments.