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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１０．６μｍＣＯ２激光的损耗为０．３~０．５ｄＢ/ｍ．
The silver halide raw material was ultra-purified by melt growth of single crystal in the horizontal region under the reaction atmosphere of chlorine, and the chlorine gas atmosphere was obtained by cracking low boiling point chlorocarbon; the general formula of the compound was CHnCl4-n (n = 0, 1, 2 ). The temperature of the purification is 450-500 DEG C and the moving speed of the temperature is 0.2-0.8 mm / min. The flow rate of the carrier gas Ar is 80-160 mL / min. The infrared absorption spectrum of the purified silver halide raw material shows that the absorption in the region of 4000-800 cm-1 (2.5-12.5 μm) decreases with the increase of the wavelength, and the mid-infrared 4000-600 cm -1 (2.5-16 μm ) Area is the best transmission band for silver halide materials. Fiber made with this material can transmit 3.3 ~ 16μm mid-infrared spectrum; transmission loss of 10.6μmCO2 laser is 0.3 ~ 0.5dB / m.