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 increase light intensity on the target plane, laser beam array target shooting is usually used in high power laser driver divices, in which 2×2 beam array is widely used at present. The lenses adopted in beam array focusing system lens include off-axis lens and non-off-axis lens. The excellent quality of focal spot can be obtained under ideal conditions when we use the beam array focus system with non-off-axis wedged lenses. The optical propagation model of 2×2 beam array focus system is built, and the influences of various errors on its focal spots during the process of actual installation and adjusting are simulated and investigated. Results show that the mirror angle and the lens translation have great influence on the focal spots quality of the system, and the two components should be precisely adjusted. The influences of mounting angle and focal length error of the lens on the system focal spots quality are relatively little, and it is easy to be satisfied at the present conditions. The researcher′s understanding about multi-beam coherent combination scheme can be improved by this study, and it has a certain guiding significance for the installation and adjustment of practical systems.