液冷薄片构型激光器及其热管理技术

为了解决增益介质的热效应问题，提出了一种浸没式构型液冷激光器方案，该构型激光器在10Hz重复抽运频率下，获得了615mJ的能量输出，光光转换效率为21%，斜率效率为23%.基于流体力学和热力学原理，建立了激光器增益区流场的热-流-固耦合模型，利用软件模拟和有限元分析法，研究了在不同流速、泵浦功率条件下，整个增益区的温度场、速度场的分布特性；并基于增益区温度场的分布，分析了液冷条件下通过增益区的激光波前畸变特性.结果表明，增益介质的最大光程差为0.7666λ，冷却液最大光程差为－4.7331λ，说明该构型激光器有着良好的热管理性能.

Abstract

In order to solve the problem of the thermal effect of the laser gain media, a configuration named “immersed thin-disk oscillator”solid laser cooled directly with flow was proposed. Under the repeated pumping frequency of 10Hz，a maximum output energy of 615mJ was realized. The optical-optical efficiency and the slope efficiency is 23% and 21% respectively. Based on the principle of fluid mechanics and thermodynamics，the thermal-flow-solid coupling model of lasing region was established. By using the software and the method of finite element analysis, the distribution characteristics of temperature field and velocity field were studied under the conditions of different flow rate and pump power. The wavefront aberration of the laser passing the gain region was simulated under the condition of liquid-cooled. The maximum optical path difference of the gain medium and coolant liquid are 0.7666λ and －4.7331λ respectively. The results show that the laser has a good thermal management performance.

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杨鹏, 马仑, 姜彦玲, 李伟, 聂荣志, 赵朋飞, 佘江波. 液冷薄片构型激光器及其热管理技术[J]. 光子学报, 2016, 45(3): 0314007. YANG Peng, MA Lun, JIANG Yan-ling, LI Wei, NIE Rong-zhi, ZHAO Peng-fei, SHE Jiang-bo. Thermal Management Technology of a Liquid Cooling Thin-disk Oscillator[J]. ACTA PHOTONICA SINICA, 2016, 45(3): 0314007.

液冷薄片构型激光器及其热管理技术

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