Correction of phase shift in numerical reconstruction of digital holography

Digital holography became feasible with the development of charged coupled devices(CCDs). One of advantages of digital holography is no film material involving wet-chemical or other processing is necessary. In addition, in the numerical reconstruction process not only the intensity, but also the phase distribution of the stored wave-field can be computed from the digital hologram. We propose an approach of numerical reconstruction in in-line digital holography based on MATLAB. The proposed experimental setup is based on Mach–Zehnder interferometer. Then the disturbance of the zero - order image and the twin-image were eliminated by frequency domain filtering. Numerical reconstruction of the digital holography was worked out after that. In addition, we propose an approach to solve the phase shift in numerical reconstruction processing. The effectiveness of the proposed method is demonstrated by experiment.