快速计算菲涅尔衍射光场，将菲涅尔衍射公式转换为快速傅里叶变换FFT，可以直接嵌入程序中使用，对菲涅尔计算全息很有用！-Fast calculation of Fresnel diffraction field, Fresnel diffraction formula will convert the fast Fourier transform FFT, can be directly embedded program using the Fresnel CGH is useful! ! !