基于光束干涉的高功率激光鬼像分析  

Further Analysis of High-Power Lasers Ghost Images Based on Beam Interference

作　　者：张燕[1,2] 张艳丽[1] 朱健强[1] 孙平平[1,2] 刘芳[1,2] 刘德安[1] 

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理国家实验室,上海201800 [2]中国科学院研究生院,北京100049

出　　处：《光学学报》2011年第10期91-97,共7页Acta Optica Sinica

基　　金：中以高功率激光技术国际合作研究(2010DFB70490)资助课题

摘　　要：在原有鬼像焦斑空间分布研究的基础上,进一步考虑入射激光脉冲与透镜的鬼像之间发生的干涉叠加现象。参考神光Ⅱ系统,分别推导并计算了3～10ns的入射脉冲引起最小像差型双凸透镜产生鬼像干涉的最大焦距范围,然后以单位矩形脉冲平面波作为入射光,讨论存在干涉的几种情况。结果表明,由于干涉叠加效应,鬼像焦平面存在较大的调制,焦平面附近的区域也有很明显的干涉调制。干涉后鬼像的功率密度大大地超出了原有鬼像光强的估算值,特别是对于高阶鬼像,问题更加严重。Based on the previous analysis of spatial distribution of the ghost images in high-power laser system,interference among the ghost image beams reflected by front edge and the trailing edge of the pulse which overlapped together were further considered.According to the Shenguang（SG）Ⅱ facility,the maximal focal length of minimal aberration lens which induced ghost images interference were calculated corresponding to the different laser pulse width range from 3 to 10 ns.Several situations of the interferences existing with the ghost images were simply simulated with incident plane wave.The results indicate that high density modulations existed on the focal plane of ghost images which greatly enhanced the peak power of the ghost images.Near the ghost focal plane,there were also dramatically spatial interference modulations which increased ghost beam power greatly especially for the higher order ghost images,which should be emphasized greatly in practice.

关 键 词：高功率激光脉冲 鬼焦斑 多光束干涉 峰值功率 透镜 

分 类 号：O436[机械工程—光学工程]