卤化银光纤原料的超提纯

高纯原料的制备是制造高品质光纤最重要的环节，本文采用氯气氛下水平区熔法生长单晶的提纯方法对卤化银原料进行超提纯．区域熔融提纯后的卤化银原料红外吸收光谱测量显示在800～4000cm^－1范围内吸收随波长的增加而降低．经CO₂激光量热计法测量提纯后的卤化银原料在10．6μm处的吸收系数为5×10^－4Cm^－1，较提纯前降低两个数量级，制成的光纤传输损耗03～0．5dB／m

Ultrapurification of Raw Materials of Silver Halide Optical Fibers

The preparation of high purity raw materials is the foremost section in fabrication of high quality optical fibers. The material of silver halide was ultrapurified by horizontal zone melting purification in Cl₂ atmosphere. Measurement results show that infrared absorbance will decrease as wavenumber increases at 800～4000cm^-1 after the ultrapurification, and the absorption coefficient of silver halide preform crystal by CO₂ laser calorimeter is less than 5×10^-4cm^-1 at 10.6μm. The absorption coefficient decreases two order of magnitude after ultrapurification. The optical fiber loss is 0.3～0.5 dB/m.