基于非均匀掺杂的激光二极管抽运固体激光系统放大介质热特性分析

Analysis of Thermal Characteristics in Laser Diode Pump Solid-State Laser with Variable Doping Amplifying Medium

利用非均匀掺杂的设计思想,针对正面抽运、背面冷却的有源反射镜放大器结构中不同激活离子掺杂分布的介质进行了模拟计算,分析并比较了传统均匀掺杂介质与非均匀掺杂放大介质中的温度、温度梯度、应力、应变以及波前畸变的分布。结果表明,与传统均匀掺杂介质相比,非均匀掺杂放大介质内的温度、温度梯度、应力、应变与波前畸变均有明显的降低。模拟结果证明,非均匀掺杂可以改善有源反射镜放大器构型冷却与产热异面的问题,可以有效地提高放大器增益介质热管理性能,为进一步讨论基于非均匀掺杂的放大介质的热管理优化提供了基础。

A simulation of performance of thermal management with variable doping gain medium in active mirror configuration of laser diode pump solid-state laser is reported. The parameters of temperature, temperature gradient, stress, strain and optical distortion for a conventional amplifying medium and several variable doping media for different doping distributions, in active mirror configuration amplifier with pumping in the front surface and cooling in the back are simulated and compared. The calculation indicates a positive result that the variable doping media can ameliorate the problem of heating and cooling in different surfaces in active mirror configuration, and can elevate the thermal, optical and mechanical performances for laser diode pump solid-state laser （DPSSL） system. The simulation results prove the feasibility for ameliorating thermal management performances in DPSSL by variable doping media.