反应氯气气氛下卤化银光纤原料的超提纯

Ultrapurification of Raw Material of Silver Halide Optical Fibers in Reacting Chlorine Atmosphere

采用反应氯气气氛下水平区域熔融生长单晶的方法对卤化银原料进行超提纯，反就氯气气氛是裂解低混点碳氯化合物得到，化合物的通式为CHnCl4-n(n=0,1,2)，提纯的温度为450－500℃，温区移动速度为0．2－0．8mm/min，载流气体Ar的流量为80－160mL/min，提纯后的卤化银原料红外吸收光谱显示，在4000－800cm^-1(2.5-12.5μm）区域内的吸收随波长的增加而降低，中红外4000－600cm^-1(2.5-16μm)区域是卤化角材料最佳的传输波段，用此原料制成的光行可传输3．3－16μm中经外光谱，传输10．6μmCO2激光的损耗为0．3－0.5dB/m.

The material of silver halide was ultrapurified by horizontal zone melting purification in reacting chlorine atmosphere. The chlorine atmosphere was made by decomposed chlorocar-bon with low boiling point [CHnCl4-n(n=0,l,2)]. The purification parameters were as follows: temperature 450-500℃, speed of zone 0.2-0.8mm/min and the carrier gas Ar 80-160mL/min. Measurement results show that the infrared absorbance of silver halide will decrease as wavelength increases at 2.5-12.5μm (4000-800cm-1) after the ultrapurification. The silver halide fiber is a well transparent medium for transmitting middle infrared at 2.5-16μm (4000-600cm-1). Forurier transform infrared spectra (FTIR) show that the transmittance of the fiber is better at 3.3-16μm. The loss is 0.3-0.5dB/m at 10.6μm.