100 kHz高功率高光束质量纳秒激光振荡器  

100 kHz high power high beam quality nanosecond laser oscillator

作　　者：杨天利 杨晶[1,2,4] 周王哲 李雪鹏 王小军 彭钦军 Yang Tianli;Yang Jing;Zhou Wangzhe;Li Xuepeng;Wang Xiaojun;Peng Qinjun(Key Laboratory of Solid State Laser,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Function Crystal and Laser Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China;Institute of Optical Physics and Engineering Technology,Qilu Zhongke,Ji’nan 250000,China)

机构地区：[1]中国科学院理化技术研究所固体激光重点实验室,北京100190 [2]中国科学院理化技术研究所功能晶体与激光技术重点实验室,北京100190 [3]中国科学院大学,北京100049 [4]齐鲁中科光物理与工程技术研究院,济南250000

出　　处：《强激光与粒子束》2023年第7期48-54,共7页High Power Laser and Particle Beams

摘　　要：高功率、高重复频率纳秒脉冲激光广泛应用于激光切割、激光焊接等领域。随着激光重复频率的提升,特别是高于50 kHz时,单个周期有限的时间内难以积累足够的上能级粒子,调Q脉冲的稳定性成为了激光器设计的难点。当前主要采用主振荡器的功率放大器(MOPA)方案,直接振荡获得兼具高功率、高重复频率及高光束质量的纳秒脉冲激光还比较困难。通过对激光动力学过程的仿真模拟,定量分析了高重复频率调Q过程中脉冲强度稳定性与泵浦速率的关系,并利用负透镜使振荡器工作在具有较大基模体积的热近非稳区,实现了Nd:YAG声光调Q激光振荡器在高重复频率、高功率、高光束质量三方面的均衡设计。首次利用侧泵模块实现了100 kHz高功率高光束质量纳秒脉冲激光的直接振荡产生,脉冲强度的离散系数仅为0.041,激光输出功率超过142 W,脉冲宽度为165 ns,光束质量因子M^(2)为1.5。Nanosecond(ns)pulsed laser with high average power and high repetition rate is a potential solutionfor laser cutting,laser welding and many other processing applications.With the increase of pulse repetition rate,especially when it is higher than 50 kHz,it is difficult to accumulate enough upper state population in a limited time,and the stability of laser pulse becomes a challenge in the design of laser.The main oscillator power amplifier(MOPA)system is the main method currently used.It is difficult to obtain ns pulsed laser with high average power,high repetition rate and high beam quality through direct oscillation.In this paper,the quantitative relationshipbetween the intensity stability of laser pulse and the pump rate is analyzed according to the simulation of highrepetition rate Q-switched laser.Combined with the use of plane-concave lenses to make the cavity a thermal-near-unstable cavity with a large-volume fundamental mode,the balanced design of Nd:YAG acousto-optic(AO)Q-switched laser oscillator with high repetition rate,high power and high beam quality was realized.A direct oscillationof 100 kHz high power high beam quality ns pulsed laser by using side pumped module was realized for the first time,the discrete coefficient of pulse intensity was only 0.041,the output power exceeded 142 W,the pulse width was165 ns,and the beam quality factor M^(2) was 1.5.

关 键 词：激光振荡器 高重复频率 声光调Q 纳秒 高光束质量 

分 类 号：TN248.1[电子电信—物理电子学]