Hi all, I'm working in an exercise of advanced optics related to diffraction, in Fraunhoffer's aproximation. I need to calculate the FT of a gaussian multiplied by a rectangle function, i.e, FT(exp(-x^2)*rect(x/a)), and I cant obtain a result expressed using analytical common functions. I can only obtain one solution using Fresnel integrals. I think there could be a simpler way of expressing this result. Anyone can help me? Thanks.