无色萤石单晶体具有优异的光学特性,如宽广的透射波段(0.13—9.0微米);高度的透明度(10公分厚的晶体透过率高达95%以上。),所以萤石很早就被用作光学材料,制造紫外、红外仪器的分光稜镜、透镜、透射窗口和滤光片等。萤石还具有可见光区内色散很小的特点,常被用作复消色差材料。但是萤石也存在一些明显的缺陷,如热膨胀系数高,热导率低,经不起热震,硬度较低,解理完全,经不起强烈机械冲击,同时长期在室外使 Fluorite single crystal has excellent optical properties, such as a wide transmission band (0.13-9.0 microns); a high degree of transparency (crystal transmittance of 10 cm thick as high as 95%.) Therefore, fluorite has long been used For optical materials, manufacturing UV, infrared spectrometer prism, lens, transmission window and filters. Fluorite also has the characteristics of small dispersion in the visible region, often used as apochromatic material. But there are also some obvious flaws fluorite, such as high thermal expansion coefficient, low thermal conductivity, can not withstand thermal shock, low hardness, cleavage completely, can not withstand the strong mechanical impact, while long-term outdoor use