基于大芯径晶体波导的半导体可饱和吸收镜锁模激光器  

Semiconductor Saturable Absorption Mirror Mode-Locked Laser Based on Large Core Size Crystal Waveguide

作　　者：李帅[1] 李国泰 张凯伦 朱占达[1,2,3,4] 惠勇凌 雷訇[1,2,3,4] 李强 Li Shuai;Li Guotai;Zhang Kailun;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：《光学学报》2022年第10期115-120,共6页Acta Optica Sinica

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：大芯径晶体波导可吸收更高功率的泵浦光,能够实现更高的输出功率,同时在锁模运行时芯层中的峰值功率密度相对较低,而且减少了非线性效应的积累。基于此,构建了一种基于Yb:YAG大芯径晶体方波导的被动锁模皮秒激光器。实验中,首先使用高反镜替代半导体可饱和吸收镜(SESAM),在较高的泵浦功率下调节晶体波导的位置和角度以实现泵浦光与波导芯层的匹配;然后,仔细调节球面反射镜的角度,使信号光耦合进波导芯层中以尽量减小腔内的损耗。所设计的激光器采用折叠腔结构,在腔内没有色散补偿器件的情况下,实现了平均功率为10.2 W、脉冲宽度为65 ps、重复频率为30.15 MHz、单脉冲能量为0.34μJ的激光输出。Large core diameter crystal waveguides can absorb higher power pump light and achieve higher output power.At the same time,the peak power density in the core layer is relatively low during mode-locking operation,and the accumulation of nonlinear effects is reduced.Based on this,a passively mode-locked picosecond laser based on Yb:YAG large core diameter crystal square waveguide is constructed.In the experiment,firstly,the high mirror is used instead of the semiconductor saturable absorption mirror(SESAM),and the position and angle of the crystal waveguide are adjusted to match the pump light with the waveguide core layer under higher pump power.Then,the angle of the spherical mirror is carefully adjusted to couple the signal light into the waveguide core layer to minimize the loss in the cavity.The designed laser adopts a folded cavity structure,and achieves an average power of 10.2 W,pulse width of 65 ps,repetition rate of 30.15 MHz,and single pulse energy of 0.34μJ without dispersion compensation device.

关 键 词：激光器 固体激光器 锁模激光器 晶体波导 半导体可饱和吸收镜 

分 类 号：TN248.1[电子电信—物理电子学]