对称多通泵浦双包层Yb:YAG平面波导放大器  

Symmetrical Multi-Pass-Pump Double-Clad Yb:YAG Planar Waveguide Amplifier

作　　者：曲波[1] 刘奇[1] 王思博 朱占达[1,2,3,4] 雷訇 惠勇凌[1,2,3,4] 李强 Qu Bo;Liu Qi;Wang Sibo;Zhu Zhanda;Lei Hong;Hui Yongling;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》2021年第23期166-174,共9页Acta Optica Sinica

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

摘　　要：设计了一种高功率多通泵浦Yb:YAG平面波导激光放大器。所设计的放大器采用对称泵浦方案,泵浦源对称分置于平面波导两侧,泵浦光在平面波导中经反射多次通过芯层以实现多通泵浦。分析了泵浦吸收特性的影响因素,推导了平面波导几何参数间的约束关系,并对平面波导结构进行了优化。使用激光放大模型分析了所设计平面波导放大器的泵浦吸收特性、温度特性及放大输出特性。结果显示:所设计多通泵浦平面波导放大器具有高泵浦吸收率,以及高的光-光转换效率,当注入种子光功率为200 W,泵浦功率为10 kW时,对称多通泵浦平面波导的泵浦吸收率最大值为96.8%,对应的放大输出功率为7483 W,光-光转换效率为72.8%;同时,良好的吸收均匀性使其受热效应的影响更小,有利于获得高质量的光束。A high-power multi-pass-pump Yb:YAG planar waveguide laser amplifier was designed.The new amplifier adopted symmetrical pumping scheme,in which the pump sources were symmetrically placed on both sides of the planar waveguide.The pump light,reflected in the planar waveguide,passed through the core multiple times.Multi-pass pump was thereby achieved.The factors affecting the pump absorption characteristics were analyzed,and the relationships between the geometric parameters of the planar waveguide were determined.The planar waveguide structure was optimized.The pump absorption,temperature,and output amplification characteristics of the planar waveguide amplifier were analyzed by a laser amplification model.The results show that the designed multi-pass-pump planar waveguide amplifier has high pump absorption and optical-to-optical efficiencies.When the power of the injected seed light is 200 W and the pumping power is 10 kW,its maximum pump absorption efficiency is 96.8%,with a corresponding amplified output power of 7483 W and an optical-to-optical efficiency of 72.8%.Meanwhile,a good absorption uniformity makes the amplifier less affected by the heating effect,which is beneficial to obtaining high-quality beams.

关 键 词：激光光学 YB:YAG 平面波导 激光放大 高功率 多通泵浦 

分 类 号：TN248.1[电子电信—物理电子学]