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基于光传输的多叉树原理,研究了用于惯性约束聚变的高功率激光装置终端光学系统中多级衍射和多次反射杂散光与鬼点分布,根据光线经色分离光栅的传播规律进行了实际鬼光路计算,对聚焦透镜、色分离光栅、防护片组成的光学系统产生的杂散光及会聚鬼点进行了全面分析,得出三次谐波鬼点620个,二次谐波和基频光的会聚鬼点相对较少。分析表明非球面的一次反射鬼点最具威胁,大角度衍射和倾斜平面反射使大量鬼点向系统外部移动,并增大鬼光束的像差,减小其危害。这种方法可以以动态数据结构捕捉全部鬼点,并获得鬼光束结构。
Based on the multi-tree principle of optical transmission, the multi-order diffraction and multi-reflection stray light and ghost distribution in the terminal optical system of high power laser device used for inertial confinement fusion are studied. According to the propagation law of light passing through the color separation grating, The actual calculation of ghost light path, focusing lens, color separation grating, protective film optical system consisting of stray light and ghost ghost points were analyzed a comprehensive analysis of the third harmonic ghost 620 points, the second harmonic and the fundamental frequency of light The convergence of ghost points is relatively small. Analysis shows that aspheric ghost points are the most threatening. Large-angle diffraction and inclined plane reflection cause a large number of ghost points to move toward the outside of the system, and increase the aberration of the ghost beam to reduce the harm. This approach captures all ghost points with dynamic data structures and obtains a ghost beam structure.