激光技术Issue(1)：87-90,4.DOI:10.7510/jgjs.issn.1001-3806.2014.01.019
基于角谱理论的频移插值法衍射计算
Diffraction computation with frequency shift interpolation based on theory of angular spectrum
摘要
Abstract
In the discrete numerical calculation of diffraction distribution,the total number of sampling points following sampling theorem increases with the augment of propagating distance.Although the traditional zero-padding method resolves this problem,the calculation load increases inevitably and PC’s memory can not afford.A novel frequency shift interpolation,i.e.,utilizing frequency spectrum calculation after shift in Fourier domain,was proposed.In the method,more sufficient spectrum components can be got without the increase of sampling number.A complete diffraction distribution is accomplished by splicing the light field obtained by spectrum of each shifted interpolation.The results show that the proposed method successfully evades the great sampling number caused by larger diffracting distance.Comparing with traditional zero-padding method,calculation load is decreased notably and the requirement to memory in numerical calculation is depressed.关键词
衍射/光栅/角谱/频移/插值Key words
diffraction/gratings/angular spectrum/shift in frequency domain/interpolation分类
数理科学引用本文复制引用
缪正祥,李重光,张中恒..基于角谱理论的频移插值法衍射计算[J].激光技术,2014,(1):87-90,4.基金项目
云南省应用基础研究基金资助项目 （）
