说明：  总结了衍射传输的数值计算方法，分布傅里叶变化法，时域法，卷积法，单傅里叶变换法，角谱理论，以及衍射计算的适用范围！可通过MATLAB编程来实现。
(Summarized the numerical calculation methods of diffraction transmission, distributed Fourier transform method, time domain method, convolution method, single Fourier transform method, angular spectrum theory, and the scope of application of diffraction calculation! It can be realized by MATLAB programming.)