重金属氧化物玻璃中—OH的存在对玻璃光学性质产生干扰影响，使玻璃在中红外波段产生较大损耗。玻璃除水是制作中红外玻璃的关键环节。讨论了羟基对重金属氧化物玻璃的光学、光谱学及光纤性质的影响，总结了近年来出现的中红外重金属氧化物玻璃除水方法(反应气氛除水法、鼓泡法、引入氟化物、氯化物除水等)，对比分析了不同方法的除水效果和研究进展，对今后中红外重金属氧化物玻璃除水技术的现状与发展趋势进行了概括。

The existence of —OH in the heavy oxide glasses leads to enormous loss in mid-infrared region due to worsening optical properties. Thus, removal of water in glass especially for mid- infrared application is a critical step. The effect of hydroxyl groups on the optical, spectroscopic and the optical fiber properties of the mid- infrared heavy metal oxide glass is discussed, the widely used dehydration techniques in recent years(reaction atmosphere process, budding dry gas, fluoride dehydration, chloride dehydration, etc.) are reviewed,their dehydration effects and the research progress are presented, and the status and the development direction of dehydration techniques in mid-infrared heavy oxide glasses are summarized.