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基于蒙特卡罗算法及ASAP光学软件构建了完整分析万焦耳级激光主放大器抽运动力学过程的模型。该模型包含三维空域和一维时域,分析计算了包层完全吸收时不同抽运时刻通光面上的储能分布,其变化趋势与文献报道结果相同,验证了建模的正确性。通过对比包层完全吸收和部分剩余反射时的平均小信号增益系数,发现当剩余反射率低于0.05%时,两者区别并不明显。考虑包层部分反射后平均小信号增益系数的计算值比测量值4.42/m偏小6%,分析其原因主要在于模型计算过程中的采用部分近似、未考虑自发辐射的光谱宽度以及钕玻璃中存在的亚表面缺陷等。
Based on the Monte Carlo algorithm and ASAP optical software, a complete model for analyzing the pumping dynamics of a 10,000 Joule laser master amplifier was constructed. The model contains three-dimensional airspace and one-dimensional time domain. The distribution of stored energy of the light-transmitting surface at different pumping times is analyzed and calculated. The trend of the stored energy distribution is the same as the reported result, which verifies the correctness of the modeling. By comparing the average small signal gain coefficient of complete absorption and partial residual reflection, it is found that the difference between the two is not obvious when the residual reflectance is less than 0.05%. Considering that the calculated average value of the small signal gain after reflection of the cladding is 6% less than the measured value of 4.42 / m, the reason for this analysis is that the partial approximation is adopted in the model calculation, the spectral width of spontaneous emission is not considered, Existing sub-surface defects and so on.