An Experimental Method of Eliminating Zero-order Diffraction in Digital Off-axis Holography
一种消除数字离轴全息零级像的实验方法

An experimental method of eliminating zero-order diffraction in the reconstructed image of off-axis digital holography is presented. Holographic diffraction grating acts as a beam splitter,and an off-axis holography system is formed. The holograms of object with different recording parameters are obtained by adjusting reflecting mirror in recording optical system to vary incidence orientation of the object beam in CCD to introduce phase shift. The zero-order image can be eliminated by numerically processed the hologram of object with different recording parameters. The theoretical analysis has been done in detail,and the experimental results are also given. The experimental results show that the method presented in this paper is feasible,simple in optical structure and easy in operation and data processing.