Phase information reconstruction based on digital lateral shearing approach in digital holography

Based on the concept of the digital lateral shearing interferometry (LSI) and the idea of the automatic aberration compensation (AAC), a method to eliminate the linear term of the sheared phase map in digital holographic reconstruction is proposed. The procedures for reconstruction phase image using the LSI-DH method have been analyzed in detail, which indicates that one-dimensional phase unwrapping must be applied to the original phase map before lateral shearing. Moreover, the zeros pad must be applied to the hologram if the phase difference between the two adjacent pixels of the shearogram map is more than 2π. The computer simulations, which are based on the Fresnel digital holography with pre-magnification, demonstrate the validity of the proposed method.