空间啁啾对非线性“热像”的影响  

The influence of spatial chirp on nonlinear hot-image

作　　者：游开明[1] 张龙青 田立伟[1] You Kaiming Zhang Longqing Tian Liwei(Department of Computer, Guangdong University of Science and Technology, Dongguan 523083, Chin)

机构地区：[1]广东科技学院计算机系,广东东莞523083

出　　处：《湖南科技大学学报（自然科学版）》2016年第4期70-76,共7页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：广东省重大科研平台项目自然科学类(2014KTSCX210)

摘　　要：基于无像差自聚焦理论,在远场及光学薄近似条件下,分别利用解析和数值模拟方法研究了空间啁啾高斯光束通过自由空间和非线性介质时形成的"热像"效应,讨论了啁啾系数对非线性"热像"的影响.结果表明:啁啾系数对非线性"热像"的位置和强度都有较大影响,使用负啁啾小口径高斯光束可以在很大程度上抑制非线性"热像"强度,同时调整啁啾系数C改变"热像"位置,使之偏离下游光学元件,从而可以确保光学系统安全运行.Based on the no aberration self-focusing theory, under the condition of the optical thin and far field approximation, hot-image effect formed when the space chirp gaussian beams pass through free space and nonlinear medium was studied using analytical and numerical simulation methods, respectively. The influence of the chirp parameter on the nonlinear hot image was discussed. Results show that the chirp parameter has a great influence on nonlinear hot-image position and strength. Nonlinear hot-image strength can be largely inhibited by negative chirp and small-bore gaussian beam. Moreover, hot-image position can be changed by adjusting the chirp parameter C, making it deviated from the downstream of the optical element and ensuring the safe operation of the optical system.

关 键 词：空间啁啾高斯光束 非线性“热像” 啁啾系数C 

分 类 号：O437[机械工程—光学工程]