Tm:YAG激光器晶体热效应数值模拟

对采用晶体棒端部辅热方法实现低温工作的Tm:YAG激光器, 建立了晶体棒热效应理论模型, 采用有限差分法对晶体棒温度场、应力场及光学畸变进行模拟计算.模拟结果表明：辅热设计可显著减小晶体最大应力, 减小应力损坏;端部辅热使得温度和应力分布复杂, 引起折射率分布多变, 但变化值小, 说明端部辅热对光线在晶体内的传播影响微小; 辅热区域结构紧凑, 且对激光器封装产生的影响较小.

Abstract

The theoretical model of the thermal effects of the Tm:YAG laser which works at a low temperature by heating the rod ends of crystal was established. The temperature, stress and optical distortion of the crystal were simulated by the finite difference method. The simulation results show that, the designing of heating the crystal rod ends can reduce the maximum stress of crystal and minimize the stress damage accordingly. Although the complexity of the distribution of the temperature and stress caused by the crystal rod ends heating can cause a complex refractive index distribution, but it makes little effect on the light propagation because of the small changing refractive index value. The heating area is small and has no enough influence on the laser packaging.

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姚育成, 刘丹琳, 黄楚云, 徐国旺, 王贝. Tm:YAG激光器晶体热效应数值模拟[J]. 光子学报, 2016, 45(7): 070714001. YAO Yu-cheng, LIU Dan-lin, HUANG Chu-yun, XU Guo-wang, WANG Bei. Crystal Thermal Effect Simulation of Tm:YAG Laser[J]. ACTA PHOTONICA SINICA, 2016, 45(7): 070714001.

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