Using Gaussian spectrum for holography display with femtosecond laser

Femtosecond laser is not monochromatic but exhibit a large spectrum. Due to their low coherence length, a reduction of parasitic fringes can be expected to reduce the optical noise. In this paper we will present in-line holography in the case of a pulse with a Gaussian spectrum is investigated analytically by using the steepest descent method. This method enables to calculate the intensity distribution of the diffraction field and fractional orders Fourier transform to reconstruct hologram with micro object.