1645 nm单频脉冲Er:YAG陶瓷激光器  

1645-nm Single-Frequency Pulsed Er∶YAG Ceramic Laser

作　　者：宋睿 李尚桦 陈朝勇 王庆 高明伟 高春清 Song Rui;Li Shanghua;Chen Chaoyong;Wang Qing;Gao Mingwei;Gao Chunqing(MOE Key Laboratory of Photoelectronic Imaging Technology and System,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《中国激光》2021年第5期175-182,共8页Chinese Journal of Lasers

基　　金：科技部重点研发计划(2017YFB0405203)。

摘　　要：设计和研制了1645 nm Er∶YAG单频脉冲激光器系统,采用注入种子技术和对称泵浦的双Er∶YAG陶瓷结构,当脉冲重复频率为200 Hz时,获得了最大平均脉冲能量为22.75 mJ、脉冲宽度为223.1 ns的单频调Q脉冲激光输出,x和y方向上的光束质量因子分别为1.16和1.15,0.5 h内单频脉冲的中心频率稳定性为578 kHz,激光脉冲输出能量的不稳定性小于0.5%。Objective Stable single-frequency and high-energy lasers in the eye-safe band are important light sources for lidars and coherent detection.Currently,many studies have reported a human eye-safe 1645-nm single-frequency pulsed laser output.Er∶YAG crystals and Er∶YAG ceramics are two main types of common-gain media for realizing 1645-nm lasers.Compared with crystalline materials,ceramic materials possess the advantages of short growth time,large-scale production,and flexible doping concentration.In the present study,we report the results of an engineered prototype of a single-frequency pulsed Er∶YAG ceramic laser.The volume of this laser system is reduced,and the frequency stability is improved.An optimized symmetrically pumped double Er∶YAG ceramic structure is designed to solve the problem of performance degradation caused by limited space.Such a single-frequency laser light source with a smaller volume and higher stability is more helpful for a practical application.Methods The single-frequency Er∶YAG pulsed laser system with seed injection mainly includes three parts:an Er∶YAG master laser,a symmetrically pumped dual Er∶YAG ceramic ring-cavity slave laser,and a detectioncontrol system.To improve the stability of the pulsed laser,a single-frequency continuous Er∶YAG non-planar ringcavity laser is employed as a master laser.To improve the mode-matching efficiency and reduce the laser volume,the slave-laser cavity is designed with a multiple-folding structure that adopts total reflecting mirrors.This structure is a symmetrical one of dual laser-diode(LD)-pumped dual Er∶YAG ceramics.To simultaneously satisfy the requirements of pulse energy and pulse width for lidars,the total cavity length is set to 2.3 m.By using multiple folding mirrors,the volume of the cavity is reduced,and a space is reserved for the seed laser at the center position to realize a reasonable use of space.The working process of the seed injection and laser output is described as follows:appolarized seed light is reflected by t

关 键 词：激光器 全固态激光器 注入锁定 大能量 单频 激光陶瓷 

分 类 号：TN248[电子电信—物理电子学]