高功率光纤激光器用关键无源器件研究进展  

Research Progress on Key Passive Devices for High-Power Fiber Lasers

作　　者：陈子伦 李智贤 王蒙 王泽锋 许晓军[1,2,3] 陈金宝 Chen Zilun;Li Zhixian;Wang Meng;Wang Zefeng;Xu Xiaojun;Chen Jinbao(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,Hunan,China;State Key Laboratory of Pulsed Power Laser Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073 [3]脉冲功率激光技术国家重点实验室,湖南长沙410073

出　　处：《光学学报》2023年第17期129-139,共11页Acta Optica Sinica

摘　　要：光纤无源器件是实现高功率光纤激光系统的重要组成单元,其性能指标直接决定着系统的整体性能参数。本文综述了国防科技大学高能激光研究团队在高功率光纤激光器用关键无源器件方面的最新研究进展,主要包括包层光滤除器、光纤端帽、信号泵浦合束器和信号合束器等无源器件,重点介绍了光纤激光无源器件的工艺制作流程、工艺难点和性能指标。Significance Fiber lasers feature sound beam quality,compact structure,and flexible transmission.In recent years,they have developed rapidly and have been widely applied in industrial fields,such as metal cutting,remote welding,3D cutting,and laser marking.With the rapid development of high-power and high-brightness laser diode(LD),and fabrication technologies of double clad fibers,the output power of fiber lasers continues to increase.In addition to gaining fibers as the core raw material of fiber lasers,the performance indicators and research progress of fiber passive devices,including but not limited to fiber Bragg gratings,cladding optical filters,fiber end caps,end pump/signal combiners,and signal combiners,are also closely related to the development of fiber lasers.The cladding light filter is employed to filter the cladding light by breaking the total reflection condition of the outer boundary of the fiber cladding,which causes the cladding light to be transmitted outside the cladding through refraction,scattering,or absorption effects.The fiber end cap is a high-power device designed for processing the output end face of high-power fiber lasers and amplifiers.By expanding the core of the output fiber to reduce the optical power density at the output end,the fiber end face is protected from damage.Additionally,an anti-reflective film is applied to the output surface of the glass cone rod to avoid the back light from ruining the laser or amplifier.The function of the end pump/signal combiner is to efficiently couple several pump beams and one signal beam into the double clad fiber spontaneously.Therefore,the fusion loss and signal quality deterioration rate are two important optical performance indicators for this combiner.The signal combiner is designed to combine multiple medium power fiber lasers to obtain higher-power fiber laser output,with the advantages of compact structure,high reliability,low cost,and sound stability.We introduce the latest research progress of the high-energy laser research team a

关 键 词：激光 光纤激光器 无源器件 光束质量 

分 类 号：O436[机械工程—光学工程]