氟锆酸盐玻璃光纤预制棒表面处理  

Surface Treatment of Fluorozirconate Glass Fiber Preform Using Nonaqueous Solution

作　　者：陈辉宇[1,2] 王欣 薛天锋[1] 孟涛[1] 何红[1] 廖梅松[1] 胡丽丽[1] 陈伟[1] Chen Huiyu;Wang Xin;Xue Tianfeng;Meng Tao;He Hong;Liao Meisong;Hu Lili;Chen Wei(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800;University of the Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2021年第7期57-65,共9页Chinese Journal of Lasers

摘　　要：管棒法加工的氟锆酸盐玻璃光纤预制棒表面和亚表面存在缺陷,这会增加氟锆酸盐玻璃光纤的界面损耗并降低光纤强度。研究了一种非水有机溶液体系的表面处理剂,其中溶剂是乙醇和戊醇的混合物,酸是盐酸和草酸的混合物,添加剂是二氯氧化锆和乙二胺四乙酸的混合物。相比于常规的水溶液体系的表面处理剂,该处理剂能更有效去除光纤预制棒的表面和亚表面缺陷,并且不存在水侵蚀表面引起的水化层和沉积杂质,降低了光纤拉制过程中的析晶和失透风险,可大幅增大光纤强度并降低光纤的损耗。光电子能谱(XPS)显示,利用该处理剂处理过的氟锆酸盐玻璃表面和本体的组分含量更接近。原子力显微镜(AFM)观测结果显示,利用该处理剂处理过的氟锆酸盐玻璃的表面粗糙度更低。实验结果表明,由该表面处理剂处理过的光纤预制棒拉制的光纤损耗更低且抗拉强度更强。说明对于氟锆酸盐玻璃光纤预制棒而言,非水有机溶液体系的表面处理剂比传统的水溶液体系表面处理剂更为合适。Objective Fluorozirconate optical glasses are widely used as fibers because of their excellent optical properties,such as their transparency in the mid-infrared wavelength range around 8μm.These glass fibers show a wide range of military and industrial applications,such as in the ultra-low loss,long,and repeaterless optical communication links.They are typically fabricated from the fluorozirconate glass preform by the rod-in-tube method that allows for precise control of fiber dimension and geometry.To a large degree,the fiber quality depends on the quality of the preform.Before fabrication of the fluorozirconate glass fiber,the preform must undergo optical cold processing,including grinding and polishing.After shown in the structure model of the glass surface in Fig.1,defects,such as impurities,scratches and microcracks,are introduced on the surface and subsurface of the fiber preform during this processing.During the fiber fabrication process,the defects end up at the core/cladding interface,decrease the strength of the fiber,and increase the optical losses.An acid treatment is an effective method to enhance the mechanical strength of the optical glass surface and eliminate the surface and subsurface defects.In general,the preform surface of the fluorozirconate glass fiber is treated with an aqueous acid solution,such as hydrochloric acid or boracic acid.However,the fluorozirconate glass surface degrades rapidly upon exposure to aqueous media or humid atmospheric environments because of its poor chemical stability.Therefore,the conventional surface treatment of fluorozirconate glass fiber preform by etching with an aqueous acid solution increases the surface roughness and creates a hydrated surface layer.It also causes precipitation of crystalline dissolution products on the surface,which increases the optical losses,decreases the tensile strength of the fiber,and increases the risk of devitrification during fabrication of the fiber.Therefore,it is more optimal to treat the fluorozirconate glass surface using

关 键 词：材料 表面处理 光纤预制棒 氟锆酸盐玻璃 非水体系 光纤损耗 

分 类 号：TQ171.73[化学工程—玻璃工业] O436.3[化学工程—硅酸盐工业]