Phase retrieval for off-axis digital holography using multiplexing with hologram rotation and complex encoding

An efficient method of reconstructing the phase distribution for off-axis digital holography is proposed using hologram multiplexing with hologram rotation and complex encoding. A first hologram and a second 180° rotated hologram from a hologram sequence are first assembled into a synthetic hologram using the complex encoding method. Then, digital reconstruction processes, including Fourier transformation and band-pass filtering, are performed on both holograms together. Results including phase distributions and carrier information of the two holograms are obtained. Through a division operation, carrier can be removed without redundant operations, fitting procedures, or prior knowledge of the system. Our simulations and experiments demonstrate the feasibility and validity of the method. The results obtained show an accurate phase reconstruction with an improved processing speed.