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提出了一种高功率激光系统中鬼点空间坐标的快速定位算法,用于在设计阶段分析系统中的多次反射与多级衍射鬼点,以避免对系统造成危害。算法采用二叉树表示的多叉树存储鬼光束数据,同时追迹第一近轴光线和实际主光线,依据第一近轴光线确定鬼点的z坐标zg,将实际主光线与z=zg平面的交点作为实际鬼点位置。以倾斜透镜和含衍射元件的终端光学系统(FOA)为例预测了鬼点的空间坐标,经高密度实际光线追迹法验证,在所得鬼点平面相应位置确有光能聚集,表明鬼点空间坐标与实际鬼光束的密集区域相符。使用该方法在16 s内定位了含222面的激光系统的13124个鬼点。
A fast location algorithm of ghost space coordinates in high power laser system is proposed to analyze the multi-reflection and multi-order diffraction ghost points in the system during the design stage to avoid any harm to the system. The algorithm uses a binary tree to represent the multi-fork tree to store the data of the ghost beam. At the same time, the first paraxial ray and the actual main ray are traced, and the z coordinate zg of the ghost point is determined according to the first paraxial ray. The actual main ray and z = zg plane Intersection as the actual location of the ghost. Taking the tilted lens and the FOA as an example, the space coordinates of the ghost point are predicted. After the high-density actual ray tracing method is verified, the optical energy accumulation at the corresponding ghost point plane shows that the ghost point The spatial coordinates match the dense area of the actual ghost beam. Using this method, 13124 ghost points of a 222-sided laser system are located within 16 s.