反应氯气气氛下卤化银光纤原料的超提纯

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,反应氯气气氛是由裂解低沸点碳氯化合物得到;化合物的通式为ＣＨ_ｎＣｌ_４－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)区域是卤化银材料最佳的传输波段．用此原料制成的光纤可传输３．３~１６μｍ中红外光谱;传输１０．６μｍＣＯ_２激光的损耗为０．３~０．５ｄＢ/ｍ．

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

The material of silver halide was ultrapurified by horizontal zone melting purification in reacting chlorine atmosphere. The chlorine atmosphere was made by decomposed chlorocarbon with low boiling point CH_nCl_4-n(n=0,1,2)]. 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.