LD脉冲泵浦Er^(3+)/Yb^(3+):Lu_(2)Si_(2)O_(7)晶体百kHz激光器  

Design and research of LD pulse pumped Er^(3+)/Yb^(3+):Lu_(2)Si_(2)O_(7)crystal 100 kHz laser

作　　者：彭嘉宁 韩雪 聂霄璐 高翔[1] 朱占达[1,2] 雷訇 李强[1,2] PENG Jianing;HAN Xue;NIE Xiaolu;GAO Xiang;ZHU Zhanda;LEI Hong;LI Qiang(Institute of Laser Engineering,College of Physics and Optoelectronic Engineering,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Laser Technology,Beijing 100124,China)

机构地区：[1]北京工业大学物理与光电工程学院激光工程研究院,北京100124 [2]北京市激光应用技术工程技术研究中心,北京100124

出　　处：《红外与激光工程》2024年第8期49-55,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(62075003,62275007);教委科研计划项目(KZ202110005010)。

摘　　要：目前1.5μm激光二极管(Laser Diode,LD)泵浦的铒镱共掺玻璃/晶体被动调Q微型激光器广泛应用于激光测距、激光雷达等领域。随着激光器输出重频的增加,玻璃面临突出的热效应问题,晶体的热导率是玻璃的10倍以上,有望能够实现比玻璃基质更高重频的激光输出。报道了一种通过LD脉冲端面泵浦Er^(3+)/Yb^(3+):Lu_(2)Si_(2)O_(7)晶体的百kHz人眼安全激光器。通过实验优化增益介质掺杂浓度和长度、泵浦光斑尺寸和调Q晶体初始透过率等实验参数,同时适当缩短脉宽,优化泵浦占空比,提高了输出重频的稳定性。最终获得了重频为100 kHz、单脉冲能量0.7μJ、脉冲宽度240 ns、光束质量M^(2)=1.61的1537 nm脉冲激光输出。实现了输出脉冲频率与泵浦的一致,保证了输出重频的稳定性,有效解决了输出重频具有随机性、不稳定、不可控等问题。Objective At present,LD pumped Er^(3+)/Yb^(3+)co-doped glass/crystal passively Q-switched microchip laser is widely used in laser ranging and lidar.With the increase of laser output repetition rate,glass has a serious thermal effect problem.The thermal conductivity of crystal is more than 10 times that of glass,which can achieve higher repetition rate.This article reports a 100 kHz human eye safe laser pumped by an LD pulse end face in Er^(3+)/Yb^(3+):Lu_(2)Si_(2)O_(7)crystal.By optimizing experimental parameters such as pump spot size,pump duty cycle,and initial transmittance of Q-switched crystals,a repetition rate of 100 kHz and a single pulse energy of 0.7μJ were obtained.A 1537 nm pulsed laser output with a pulse width of 240 ns and a beam quality of M^(2)=1.61.Finally,the consistency between the output pulse frequency and the pump has been achieved,ensuring the stability of the output repetition frequency and effectively solving the problems of randomness,instability,and uncontrollability of the output repetition frequency.Methods In this study,the factors that affect the output of LD end pumped passively Q-switched laser include crystal doping concentration and length,pump beam diameter,initial transmittance of saturable absorber and output coupling mirror(OC)transmittance.Under the theoretical simulation,the general optimization range of the above parameters was obtained,and the optimal parameters were obtained through the experiment.The optimal doping concentration of Yb^(3+)and length of Lu_(2)Si_(2)O_(7)crystal were obtained by comparing the free oscillating output power at different OC transmittance.In order to achieve the repetition frequency of 100 kHz Q-switched pulse laser output,we used the control variable method to optimize the pump beam diameter,initial transmittance of saturable absorber and OC transmittance,and obtained the best experimental parameters by comparing the output frequency and single pulse energy.Results and Discussions The results of free oscillating were shown(Fig.2),the outp

关 键 词：固体激光器 百kHz 脉冲泵浦 被动调Q Er^(3+)/Yb^(3+):Lu_(2)Si_(2)O_(7)晶体 

分 类 号：TN248.1[电子电信—物理电子学]