保偏铒镱共掺光纤制备及其激光性能研究  

Fabrication and Laser Performance of Polarization-Maintaining Erbium-Ytterbium Co-Doped Fiber

作　　者：李文臻 陈阳 廖雷 褚应波 戴能利 李进延 Li Wenzhen;Chen Yang;Liao Lei;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)

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

出　　处：《中国激光》2022年第12期275-280,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61735007,61975061)。

摘　　要：随着激光雷达技术的快速发展,激光雷达在军事及民用领域中的应用不断增多。保偏铒镱共掺光纤是1.5μm激光雷达重要的增益介质,对其性能有重要的影响。成功制备出10μm/128μm保偏铒镱共掺光纤,其双折射系数为1.29×10^(-4),在1310 nm处的消光比为24 dB@4 m。基于该光纤搭建了全保偏全光纤主振荡功率放大系统,实验结果显示,当信号波长为1551 nm,光纤长度为7.5 m,940 nm泵浦功率为16.5 W时,输出功率为5.8 W,斜率效率达36%,输出激光的消光比为21 dB。该保偏铒镱共掺光纤具有优异的激光性能,为1.5μm激光雷达系统的国产化提供了新的解决方案。Objective Lidar has been widely used in wind ranging,automatic drive and sensing mapping.The reflected light signal is obtained through first emitting a Gaussian beam from the laser source and then reflecting after reaching the surface of the object.After the computer analysis,the information of the object such as orientation,attitude and distance can be obtained.However,as for a lidar system,its laser source is an important unit influencing the performance of the whole system.A fiber laser has become the best choice of the light source for a lidar system,because of its good beam quality,high pulse energy and high repetition rate.At the same time,an erbiumytterbium co-doped fiber has attracted the attention of many researches due to its advantages such as“eye-safe”and low atmospheric transmission loss.Therefore,as the most important gain medium for the laser lidar,polarizationmaintaining erbium-ytterbium co-doped fiber has important research significance.In this paper,a 10μm/128μm polarization-maintaining erbium-ytterbium co-doped fiber is successfully fabricated by the modified chemical vapor deposition(MCVD)technique combined with the solution doping technology(SDT).The structural parameters and optical properties of this polarization-maintaining erbium-ytterbium co-doped fiber are measured.And its laser performance is also studied.Methods MCVD combined with SDT is used to fabricate the erbium-ytterbium co-doped fiber.The content(mole fraction)of P_(2)O_(5) in the core is increased by more than 10% with reverse phosphorus doping and gas phase compensation.In order to avoid the defect of the core bursting during drilling,the fiber prefabricated rod is first annealed due to the high stress of its core.Through the Sagnac interferometer and the optical spectrum analyzer(OSA),the birefringence value is measured.The measurement structure is shown in Fig.3.And the measurement structure of polarization extinction ratio is also shown in Fig.5.In order to analyze the laser performance,the structure of an erbium-ytt

关 键 词：光纤光学 光纤激光器 铒镱共掺 激光雷达 保偏光纤 

分 类 号：O436[机械工程—光学工程]