基于激光脉冲在增益介质中的放大过程建立了三维放大模拟计算模型,该模型将自由空间传输与光线追迹放大相结合。在增益介质内抽运储能分布具有三维特点、离轴多程放大结构等复杂情况下,该模型能真实模拟放大后输出光束的近场分布。利用该三维放大模型针对一个12程激光二极管抽运钕玻璃放大系统进行模拟计算,计算结果准确地反映了输出光束近场分布。在此模拟结果的基础上能进一步优化多程放大光路。

A three-dimensional amplifying model for the laser system is presented. Both free space transportion model and ray-tracing amplification model are included in this model. Using the model,the distribution of output laser beam from a complicated amplifying system close to the reality can be obtained. This model is used to simulate an amplification course in a 12-pass laser diode-pumped amplifying system. Simulation results precisely show the output distribution of the laser beam from the 12-pass amplifying system. Based on the simulation results,the 12-pass beamline can be further optimized.