大模场铒镱共掺光纤制备及其激光性能研究  

Fabrication and Laser Performance of Large Mode Area Erbium-Ytterbium Co-Doped Fiber

作　　者：李文臻 陈阳 王一礴 许定超 褚应波 戴能利 李进延 Li Wenzhen;Chen Yang;Wang Yibo;Xu Dingchao;Chu Yingbo;Dai Nengli;Li Jinyan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Wuhan Changjin Laser Technology Co.,Ltd.,Wuhan 430223,Hubei,China;Shanghai Baolong Automotive Technology Co.,Ltd.,Shanghai 201619,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074 [2]武汉长进激光技术有限公司,湖北武汉430223 [3]上海保隆汽车科技股份有限公司,上海201619

出　　处：《中国激光》2022年第13期23-28,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金青年科学基金(61805093)。

摘　　要：基于改进的化学气相沉积(MCVD)工艺和溶液掺杂法,成功制备出25μm/300μm大模场铒镱共掺光纤,并研究了其激光放大性能。该光纤的纤芯数值孔径为0.12,940 nm包层的吸收系数为2.85 dB/m。搭建了全光纤主振荡功率放大(MOPA)结构测试平台,当铒镱共掺光纤长度为8 m,940 nm泵浦光功率为141 W时,输出功率最大为61.7 W,斜率效率达到42%,输出光谱没有观察到明显的放大自发辐射(ASE)。Objective With the advent of the industrialization 3.0era,a 1.5μm laser has been focused due to its“eye-safe”and low atmospheric transmission loss,which can be widely used in lidar,laser ranging,optical fiber communication and other fields.An erbium-doped fiber(EDF)with a small absorption cross section at 900--1000nm is difficult to be used for highpower laser amplification.Moreover,concentration quenching is triggered with the increase of the concentration of erbium ions.Previous reports found that ytterbium ions in the erbium-ytterbium co-doped fibers could effectively absorb pump light and transfer energy to erbium ions.Therefore,the pump conversion efficiency and output power are greatly enhanced.Moreover,the number of ytterbium ions in an erbium-ytterbium co-doped fiber is much higher than that of erbium ions,so that the concentration quenching effect is effectively inhibited.In view of these,an erbium-ytterbium codoped fiber has been the main gain medium for a 1.5μm laser.A large mode area erbium-ytterbium co-doped fiber is fabricated based on the modified chemical vapor deposition(MCVD)process and the solution doping technology,and its laser amplification performance is also investigated.Methods In the paper,an erbium-ytterbium co-doped fiber is prepared by MCVD combined with solution doping.The silica rude is prepared through corrosion,deposition,liquid phase doping,drying,vitrification,collapse,burning and other processes in the existing MCVD machine.In the gas phase doping process,the reverse deposition is utilized to improve the content of P_(2)O_(5)in the fiber core.And the doping of P promotes the energy transfer from Yb^(3+)to Er^(3+).Finally,the fiber prefabricated rod is matched with a suitable octagonal quartz sleeve and pulled into a specific size of fiber.A two-stage all-fiber main oscillation power amplification(MOPA)platform is set up to test the laser performance of the fiber.The MOPA structure contains a 1550nm continuous laser as seed light,and the 915nm and 940nm lasers as pump ligh

关 键 词：激光器 光纤激光器 铒镱共掺 大模场面积光纤 高功率激光 

分 类 号：O436[机械工程—光学工程]