为提高靶面光强,高功率激光驱动装置中常采用多路激光组束打靶,目前主要采用2×2集束的方式。集束聚焦系统中使用的透镜可分为离轴透镜和非离轴透镜,采用非离轴楔形透镜的集束聚焦系统在理想条件下可获得很好的焦斑质量。建立了2×2集束聚焦系统的光传输模型,并仿真研究了实际安装调试过程中各种误差对其焦斑造成的影响。结果表明,反射镜角度和透镜平移对系统的焦斑质量影响很大,需要对其进行精密调试;透镜安装角度和焦距误差对系统的焦斑质量影响较小,现有条件比较容易满足。本文研究可提高研究人员对多光束相干合成集束方案的认识,对实际系统的安装调试有一定指导意义。 In order to improve the intensity of the target surface, multi-channel laser beam targeting is often used in high-power laser driving devices. At present, a 2 × 2 cluster method is mainly used. The lenses used in the cluster focusing system can be divided into off-axis lenses and non-off-axis lenses. The focusing system using a non-off-axis wedge lens achieves good quality of the focal spot under ideal conditions. The optical transmission model of 2 × 2 cluster focusing system was established and the influence of various errors on the focal spot caused by the actual installation and debugging was simulated. The results show that the mirror angle and lens shift have a great influence on the focal spot quality of the system and need to be precisely debugged. The lens installation angle and focal length error have little influence on the focal spot quality of the system, and the existing conditions are relatively easy to meet. The research in this paper can improve the researchers’ understanding of multi-beam coherent synthetic beaming scheme, which is of guiding significance to the actual system installation and debugging.