In order to study intensity distribution of a broadband laser with flattened-Gaussian transverse modes passing through a hard-edged aperture , the propagation expression of each frequency component of the broadband laser was deduced on the basis of the diffraction integral , and then the propagation expression in spatial domain was obtained by means of Fourier transform .Effect of the aperture and the bandwidth on the intensity distribution was analyzed .The results show that the intensity distribution keeps somewhat flattened profile and the profile become narrower with increasing bandwidth w...
