大芯径Yb∶YAG晶体波导近衍射极限激光输出的计算和实验验证  

Calculation and Experimental Verification of Large Core Size Yb∶YAG Crystalline Waveguide with Near-Diffraction-Limited Laser Output

作　　者：薛凯 胡星[1] 程德江 朱占达[1,2,3] 雷訇 惠勇凌[1,2,3] 李强 Xue Kai;Hu Xing;Cheng Dejiang;Zhu Zhanda;Lei Hong;Hui Yongling;Li Qiang(Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Trans-Scale Laser Manufacturing Technology,Ministry of Education,Beijing 100124,China;Beijing Engineering Research Center of Laser Technology,Beijing 100124,China)

机构地区：[1]北京工业大学激光工程研究院,北京100124 [2]教育部跨尺度激光制造技术重点实验室,北京100124 [3]北京激光技术工程研究中心,北京100124

出　　处：《光学学报》2020年第19期119-125,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61378023);北京市自然科学基金(KZ201610005006)。

摘　　要：对具有高光束质量输出的晶体波导激光器的芯径增大方法进行了理论计算和实验验证。通过模拟计算各个导模的相对增益,在考虑模式竞争的情况下,采用Yb原子数分数为1.0%的Yb∶YAG作为芯层材料,Er原子数分数为0.5%的Er∶YAG作为内包层材料,芯层的基模截止厚度可以达到360μm,相当于传统计算方法的两倍。采用扩散键合技术,制备了芯层尺寸为400μm×320μm×77 mm的晶体波导,并搭建了波导激光器,得到了最大输出功率为31 W,光-光转换效率为55.3%,光束质量为1.2×1.05的近衍射极限激光输出。实验结果证实了利用模式竞争计算晶体波导基模芯径的可靠性。The method to increase the core diameter of a crystal waveguide laser with high beam quality is theoretically investigated and experimentally verified.Through the simulation calculation of the relative gain of each guiding mode and considering the mode competition,the fundamental mode cut-off thickness of the core layer can reach 360μm,twice of that by the traditional calculation method,when 1.0%Yb∶YAG is used as the core material and 0.5%Er∶YAG is used as the inner cladding material.A crystal waveguide with a core size of 400μm×320μm×77 mm is fabricated by diffusion bonding,and a waveguide laser is constructed.The maximum output power of this waveguide laser is 31 W,the conversion efficiency from light to light is 55.3%,and the near-diffraction-limited laser output with beam quality of 1.2×1.05 is obtained.The experimental results show that it is reliable to calculate the core diameter of the fundamental mode of a crystal waveguide by mode competition.

关 键 词：激光器 全固态激光器 二极管泵浦源 晶体波导 模式竞争 近衍射极限输出 

分 类 号：TN248.1[电子电信—物理电子学]