利用多光束激光输出耦合叠加是一种提高激光器输出功率的有效方法。采用两束矩形激光对准系统, 分析两光束不同对准情况下的焦斑特性。完全对准的情况下, 两束光的远场焦斑重合在一起, 焦斑能量是两光束能量之和。在实际光束对准系统中, 讨论了三种常见的对准误差, 并比较了这些误差对焦斑特性的影响。利用ZEMAX软件对设计系统进行了模拟分析, 并进行了实验验证。结果表明, 元件的位置误差会使远场焦斑能量集中度降低, 焦斑半径增大。

Multi-beam combination is an effective way to improve the laser output power. In this paper beam alignment influences on the character of focal spot in energy synthetic cases are discussed. By using two beams with rectangular aperture, we analyze the focal spot characteristics of the two beams in different alignment cases. When the two beams are completely aligned, their focal spots overlap completely, and the focal spot energy is the sum of the two beams’. We also discuss three common alignment errors, and compare their influences on the character of focal spot in the actual beam alignment system. ZEMAX software is used to simulate the design system and the results are proved by experiments. The results show that the component position error will reduce the energy and increase the root-mean-square radius of focal spot.