衍射光学元件杂散光分析的数据结构及鬼像分析

当光学系统中存在衍射元件时,特别是高功率激光光学系统中,由于多级衍射和多次反射的存在,因此系统中将会产生危害性的杂散光和鬼像。提出了一种用于衍射光学元件杂散光分析的树形数据结构,树的每一个结点描述了系统中两个表面之间传输的光束参数,并且根据光路计算结果,动态地开辟内存空间存放杂散光和鬼像的位置、能量等数据。对含1个衍射面和7个常规面的光学系统作了实例计算,表明用这种数据结构可以全面分析系统中的杂散光,给出鬼像位置和估计鬼像能量。当取最高反射次数为4次,衍射级为0到±5级时,运行时间在1s以内,成功地分析了该红外光学系统的鬼像。

Data structure of stray light analysis in systems including diffraction components and ghosts analysis

In optical systems including diffraction components especially in the high power laser systems the stray light caused by multi-order diffraction and multi-reflection will focus into ghosts.In this paper the data structure of tree used for analyzing stray light in the systems with diffraction components is presented.Each node of the tree describes a light beam from one surface to another,and will be created dynamically in RAM space for storing the locations and energy of ghosts according to ray tracing.As shown by the example composed of a diffraction surface and 7 conventional surfaces that all of the stray light and ghosts can be found by this data structure,the location and energy of each ghost can be calculated.The running time is less than 1s with the maximum reflection times of 4 and the diffraction order of 0 to±5,successfully analyzing the condition of ghost images of the system.