神光Ⅲ原型装置中鬼像的近轴计算与分析

针对神光Ⅲ原型装置,提出了一种在复杂的光学系统中进行鬼像分析的有效方法。该方法的特点在于结合了近轴光线追迹法和二叉树的数据存储结构,能对整个神光Ⅲ原型装置中可能产生的1至多阶(最高6阶)鬼像进行全面的分析,且耗费时间较短。通过分析找出了神光Ⅲ原型装置中鬼像能量较集中的几个光学表面,它们分别是:泡克尔斯盒中一个开关的前后表面,经过主放大级后的垂直反射镜面和折返系统末端的一块透镜的后表面等,这些结果都将为设计阶段排除高能量鬼像对系统元件可能造成的损伤提供有力的参考。

Paraxial calculation and analysis of the ghost in technical integration line

By studied on the ghost in the technical integration line (TIL), which is the full scale two- beam prototype for Shenguang-III laser facility, an effective method for analyzing ghost in a complex optical system is proposed. The method makes use of paraxial ray tracing and binary tree data memory structure. This software is able to make a thorough analysis of the ghosts from the first order to maximum sixth order in TIL within a limited time. Through analyzing it is found that the ghost energy in TIL is concentrated on several optical surfaces such as the front and rear planes of a unit in Pockels cell , cavity mirror behind the main amplifer and the rear surface of a lens at the end of a beam reverser sebsystem,ect. In addition, the corresponding ghost mitigation technique is addressed.