首页 | 本学科首页   官方微博 | 高级检索  
     检索      

由焦面附近光强分布实现波前重构
引用本文:贾怀庭,冯斌,李富全,向勇,王芳,韩伟,李恪宇.由焦面附近光强分布实现波前重构[J].强激光与粒子束,2010,22(5).
作者姓名:贾怀庭  冯斌  李富全  向勇  王芳  韩伟  李恪宇
作者单位:中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
摘    要:介绍了一种由光束在焦面附近几个面上的强度分布重构出光束近场波前的方法。把波前重构问题作为一个非线性优化问题,利用光束口径区域内的正交多项式模拟光束波前相位分布,通过优化多项式各项的系数,使对应的波前分布在焦面附近相应的几个面上的强度分布与已知强度分布的偏差最小,即认为由此时的多项式系数决定的近场波前代表了真实的光束波前。针对方光束口径,利用Legendre多项式模拟光束波前分布,利用共轭梯度算法对多项式系数进行了优化计算;优化过程分为几步进行以减少计算时间。重构得到的波前分布与参考波前分布符合得很好。

关 键 词:波前重构  强度分布  Legendre多项式  优化
收稿时间:1900-01-01;

Wave-front reconstruction from intensity distributions near focal plane
Jia Huaiting,Feng Bin,Li Fuquan,Xiang Yong,Wang Fang,Han Wei,Li Keyu.Wave-front reconstruction from intensity distributions near focal plane[J].High Power Laser and Particle Beams,2010,22(5).
Authors:Jia Huaiting  Feng Bin  Li Fuquan  Xiang Yong  Wang Fang  Han Wei  Li Keyu
Institution:Research Center of Laser Fusion, CAEP, P.O.Box 919-988, Mianyang 621900, China
Abstract:A simple method is introduced to reconstruct the nearfield wave-front from intensity distribution near foal plane, which is treated in this paper as an optimization problem. Proper orthogonal decomposition technique is applied to describe the wave-front to be reconstructed. By optimizing the coefficients of the polynomial to minimize the differences between simulated intensity distributions and the real intensity distributions, nearfield wave-front can be reconstructed and characterized. Simulations are carried out upon square-aperture beam using Legendre polynomial. Conjugate gradient method is used and optimization is performed for several steps to reduce executing time. The results show that the reconstructed wave-front are consistent well with the reference wave-front.
Keywords:intensity distribution  Legendre polynomial  optimization
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《强激光与粒子束》浏览原始摘要信息
点击此处可从《强激光与粒子束》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号