近衍射极限输出的大芯径尺寸晶体波导主动调Q脉冲激光器  

Actively Q-switched Pulse Laser of Large Core Size Crystal Waveguide with Near Diffraction-Limit Beam Quality Output

作　　者：王文博 惠勇凌[1,2,3,4] 朱占达 雷訇[1,2,3,4] 李强 Wang Wenbo;Hui Yongling;Zhu Zhanda;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：《应用激光》2022年第1期76-82,共7页Applied Laser

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

摘　　要：利用激光器实现高光束质量、高峰值功率输出是近年来的研究热点。采用芯层与包层折射率匹配的方法,同时利用模式竞争的选模特性,通过模拟晶体波导芯层各阶模的相对增益,计算出在腔内不同饱和光强下芯层的截止尺寸,制备了大芯径尺寸晶体波导,试验研究了大芯径尺寸晶体波导主动调Q脉冲激光器输出特性。采用芯径尺寸为320μm×400μm的1.0%(原子百分数)Yb:YAG,包层尺寸为7 mm×30 mm的0.5%(原子百分数)Er:YAG,长度为77 mm的单包层矩形晶体波导,平凹腔电光调Q,获得脉冲能量1.29 mJ@10 kHz,脉冲宽度10 ns,光束质量M^(2)=1.15×1.10的输出。试验证明大芯径尺寸晶体波导主动调Q脉冲激光器可获得近衍射极限高峰值功率脉冲输出。Using lasers to achieve high beam quality and high peak power output are research hotspots in recent years.This paper adopts the method of matching the refractive index of the core layer and the cladding layer and uses the mode selection of mode competition.By simulating the relative gain of each mode of the crystal waveguide core layer,the cut-off size of the core layer under different saturated light intensities in the cavity is calculated.A large-core size crystal waveguide was fabricated,and the output characteristics of the large-core size crystal waveguide active Q-switched pulse laser was experimentally studied.By using a 1.0%(atomic percent) Yb:YAG with core size of 320 μm×400 μm,0.5%(atomic percent) Er:YAG with cladding size of 7 mm×30 mm and length of 77 mm single cladding rectangular crystal waveguide,and a BBO Electro optic Q-switch,the pulse energy of 1.29 mJ@10 kHz,the pulse width of 10 ns were obtained,and the M^(2) value of beam quality was 1.15×1.10.Experimental results show that the high peak power pulse output with near diffraction limit can be obtained by the actively Q-switched pulse laser with large core size diameter crystal waveguide.

关 键 词：全固态激光器 晶体波导 近衍射极限输出 主动调Q 

分 类 号：TN248.1[电子电信—物理电子学]