基于快速傅里叶变换的衍射现象的数值仿真

根据夫琅禾费衍射与傅里叶变换的关系，通过构建数值遮光屏，并利用快速傅里叶变换，可以获得夫琅禾费衍射图样的二维仿真及其相对光强的三维分布图．利用Matlab实现了对单缝、圆孔及多缝的衍射现象的仿真．结果显示，该方法思路清晰，结果准确可靠，可作为教学中分析夫琅禾费衍射现象的另一种有效方法．

The numerical simulation of diffraction based on fast Fourier transform

A method to get the numerical simulation of Fraunhofer diffraction, constructing numerical opaque screen, then doing fast Fourier transform based on the relation between the diffraction and Fourier transform is presented. By this means, the 2-dimensional simulation of diffraction pattern and the 3-dimensional distribution of diffraction relative intensity can be obtained. The results of simulation analysis to single slit, aperture and multi-slits show that this method is a simple and credible way to analyze Fraunhofer diffraction in teaching.