2~5μm高功率氟铟基传能光纤  

2-5μm High⁃Power Fluoroindate⁃Based Transmitting Energy Fiber

作　　者：赵文凯 张龙飞 王在洋 刘瑞特 胡琳佳 姜益光[1] 张龙[1] Zhao Wenkai;Zhang Longfei;Wang Zaiyang;Liu Ruite;Hu Linjia;Jiang Yiguang;Zhang Long(Research Center of Infrared Optical Materials,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海光学精密机械研究所红外光学材料研究中心,上海201800

出　　处：《中国激光》2024年第11期405-409,共5页Chinese Journal of Lasers

基　　金：国家重点研发计划(2021YFB3500900);国家自然科学基金(52002385);中国科学院青年交叉团队项目(JCTD-2022-09);中国科学院载人空间站基础研究专项(ZDBS-ZRKJZ-TLC015);中国科学院青年创新促进会项目(2022244)。

摘　　要：2~5μm波段包含了“大气传输窗口”和众多分子的“指纹吸收峰”,是尖端中红外光学系统的核心工作频谱之一。氟铟基玻璃光纤在该波段具有较低的传输损耗和较高的激光损伤阈值,是众多中红外光学系统的主选传能介质。中国科学院上海光学精密机械研究所红外玻璃与光纤团队经过多年努力,发展了具有自主知识产权的氟铟基玻璃光纤产品研制平台,初步实现了氟化物光纤的国产化替代。Objective The mid-infrared band of 2‒5μm,which contains the atmospheric transmission window and the fingerprint absorption peaks of many molecules,holds vast potential applications in areas such as biomedicine,precision machining,and mid-infrared photoelectrical countermeasures.Although high-power mid-infrared lasers can be generated using methods such as nonlinear frequency conversion,the existing devices are often bulky and structurally complex,making them unsuitable for scenarios with complex optical paths or spatial constraints.Optical fibers,as an excellent and flexible light guide medium,can realize miniaturized and lightweight systems and have been widely studied.The materials mainly used for optical fibers include silicate glass,tellurite glass,fluoride glass,and sulfide glass.Among them,silicate glass fibers have an infrared cut-off edge at approximately 2.5μm,making them unable to transmit lasers in the mid-infrared range.Tellurite glass fibers exhibit significant intrinsic absorption in the wavelength range greater than 4μm,leading to rapid increases in loss and an inability to meet low-loss transmission in the 2‒5μm full spectrum.Sulfide fibers have a broader infrared transmission range;nevertheless,the absorption bands caused by S-H and Se-H bonds are challenging to eliminate,resulting in higher average loss in the 2‒5μm wavelength range.Currently,the main choice for low-loss transmission across the entire 2‒5μm range is fluoroindate fiber(InF_(3)-based fiber).This study introduces the design and preparation of InF_(3)-based fibers suitable for high-power mid-infrared laser transmission.Methods The early investigation by the research team on the crystallization behavior of fluoroindate glass indicated that in the molten state of multi-component InF_(3)-based glass,high field strength fluoride cations compete for the nearby fluoride ions,leading to phase separation.The formation of phases reduces the activation energy for non-uniform nucleation in the melt,prompting spontaneous crystalli

关 键 词：材料 氟铟基光纤 传能光纤 中红外激光 

分 类 号：TB321[一般工业技术—材料科学与工程]