Some Quantitative Analysis about Digital Holographic Reconstructed Image

By use of Fresnel diffraction and traditional holographic theory, this paper gives some quantitative analysis of the object image relation and the resolution of digital holography by computer simulation and corresponding experiment. The results shows: the object image relation of digital holography is the same as that of traditional holography, and if the collimating waves with the same wavelength are used in recording and reconstructing digital hologram, the size and shape of the reconstructed image are the same as that of the recorded object, and the incidence angle variation of reconstructing wave only make the position of the reconstructed image parallel shift and doesn′t influence the size of reconstructed image The physical meaning of the lateral resolution of digital holography is identical with that of the resolving power of optical image instrument, and the size of the lateral resolution of digital holography is determined by the diffracting limit using CCD′s size as windows at the position of reconstructed image. The results of simulation is almost the same as that of experiment.