大芯径晶体方波导SESAM锁模激光器的色散补偿研究  

Dispersion Compensation of Large Core Diameter Crystal Rectangular Waveguide SESAM Mode-Locked Laser

作　　者：张凯伦 李国泰 李帅[1] 朱占达[1,2,3,4] 惠勇凌 雷訇[1,2,3,4] 李强 Zhang Kailun;Li Guotai;Li Shuai;Zhu Zhanda;Hui Yongling;Lei Hong;Li Qiang(Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Laser Technology,Beijing 100124,China;Beijing Colleges and Universities Engineering Research Center of Advanced Laser Manufacturing,Beijing 100124,China;Key Laboratory of Trans-Scale Laser Manufacturing Technology,Ministry of Education,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部激光工程研究院,北京100124 [2]北京市激光应用技术工程技术研究中心,北京100124 [3]激光先进制造北京市高等学校工程研究中心,北京100124 [4]跨尺度激光成型制造技术教育部重点实验室,北京100124

出　　处：《中国激光》2023年第7期168-174,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(62075003);北京市自然科学基金;教委科研计划(4202007,KZ202110005010)。

摘　　要：报道了一种基于Yb∶YAG大芯径晶体方波导的全固态被动锁模激光器。在腔内使用Gires-Tournois干涉(GTI)镜对色散进行补偿,获得了平均功率为16 W、脉冲宽度为2 ps、重复频率为31.7 MHz的激光输出。实验研究了大芯径晶体方波导锁模激光器的输出特性,并提出了提升输出功率的方法。Objective High-power ultrashort pulse lasers operating in the picosecond and femtosecond time domains have important applications in strong-field physics,biomedical imaging,optical frequency conversion,and nuclear laser fusion.One approach for obtaining such high-power ultrashort pulses is the use of the amplification systems,such as chirped pulse amplification(CPA)or a master oscillator power amplifier(MOPA).However,amplifier chains produce amplified spontaneous emission(ASE),and the complex structure of the amplifier reduces the stability of the system.Another method is to use the direct output from the mode-locked oscillator,represented by a semiconductor saturable-absorber mirror(SESAM)mode-locked disk laser,which was demonstrated in 2000.The disk gain medium has a high area-to-volume ratio,which leads to excellent heat dissipation and therefore stabilizes the operation at high power.However,its low single-pass gain requires a complex multi-pass pump for improving the absorption efficiency of the pumped light,which can reduce the system stability.In 2022,our group reported a large core-size crystal waveguide mode-locked laser,providing a new solution for realizing high-power mode-locked lasers.Crystal waveguides used as gain media have good mode limiting capability and high heat dissipation capability,and they can achieve a stable high-power output.We believe that this new mode-locked oscillator has potential for power scaling.As studies related to dispersion compensation for crystal waveguide mode-locked lasers have been scarce,investigation of dispersion compensation to find ways to increase power is essential.Methods The semiconductor saturable-absorber mirror used for mode-locking introduces the tendency of the laser towards Q-switching instabilities;thus,the Q-switching mode-locking(QML)operation of the laser can be realized with a repetition frequency of the order of kHz.This leads to the generation of high-energy pulses that will cause irreversible damage to the SESAM.The cavity design follows the cond

关 键 词：激光器 锁模 晶体波导 半导体可饱和吸收镜 高功率 

分 类 号：TN248.1[电子电信—物理电子学]