本文通过热传导方程建立了激光晶体在进行主振荡功率放大时的内部温度空间分布模型。在此基础上,比较了单端泵浦与双端泵浦行波放大装置激光晶体热分布的情况,得出了双端泵浦较单端泵浦在热效应上具有一定优势的结论。并且,我们对双端泵浦行波放大装置中的各项参数进行了优化,在分析了双端泵浦主振荡功率放大的激光晶体及泵浦源参数对热分布影响的基础上,设计了掺杂原子数百分比浓度为02％,长度19 mm的激光晶体及腰斑为650 μm的泵浦源,获得了一个激光晶体内热分布较为均匀的双端泵浦行波放大装置。

In this paper,a spatial temperature distribution model of laser crystal was established by means of heat conduction equation in case of the master-oscillator power amplifier (MOPA) configuration.On this basis,the thermal distribution of laser crystals in single-end-pumped and double-end-pumped amplifiers were numerically compared,concluding that the spatial temperature distribution at the laser crystal of double-end-pumped MOPA configuration was superior as compared to that of the single-end-pumped MOPA configuration.Furthermore,based on analyzing the influence of the parameters of the laser crystal and the beam waist radius of the pump source on the thermal distribution of the laser crystal,we employed a laser crystal with doped concentration of 02％ and length of 19 mm as well as a pump source with waist radius of 650 μm,constructed the double-end-pumped MOPA with uniform thermal distribution.