基于光学设计软件ZEMAX,通过Monte Carlo光线追迹法,对比研究了采用三种设计方式的二次反射聚焦系统在不同类型角度偏差下的聚焦性能参数的变化。结果表明:任何微小的角度偏差都会导致聚焦性能急剧下降和聚焦位置大幅偏离。聚焦系统存在角度偏差时,不同设计方式的聚焦系统会形成不同形状的点火区域,这将导致激光推力器产生完全不同的飞行的轨迹和姿态。 Based on optical design software ZEMAX, the Monte Carlo ray tracing method was used to study the changes of focusing performance parameters of different types of angular deviation using the three design methods. The results show that any slight angular misalignment can result in a sharp drop in focusing performance and a substantial deviation of the focus position. When there is angular deviation in the focusing system, the focusing system of different design forms different shaped ignition zones, which will lead to totally different flying trajectories and poses of the laser thruster.