高纯度的卤化银原料是制备低损耗卤化银多晶光纤最基本的物质基础 .采用高真空熔炼提纯工艺方法对光谱纯级卤化银原料进行提纯 .原料提纯前后的红外吸收光谱测试结果显示 ,高真空熔炼提纯后的卤化银原料红外吸收在 80 0～ 4 0 0 0cm- 1范围内平均降低 50 % . The high purity silver halide raw material is the most basic material foundation for the preparation of low loss silver halide polycrystalline optical fiber.The high purity vacuum melting process is used to purify the pure silver halide raw material.The results of infrared absorption spectroscopy before and after the raw material purification show that high The infrared absorption of the silver halide raw material after vacuum smelting is reduced by 50% on average in the range of 80 0 ~ 40 000 cm -1.