Fast and robust reconstruction using off-axis-optimized conjugate iteration for single-exposure dual-wavelength digital holography

A single-exposure dual-wavelength digital holographic method is proposed for fast and robust reconstruction using off-axis-optimized conjugate iteration. A dual-wavelength digital holographic structure is constructed to acquire a composite hologram containing both an in-line hologram and an off-axis hologram in a single-exposure. In this context, an off-axis-optimized conjugate iterative method is performed, which uses off-axis phase to provide an initial value for the conjugate iterative process. Then, the in-line holography amplitude constraints are performed on the virtual holographic plane and the conjugate holographic plane until the algorithm converges. The low-frequency phase component of the convergence result is further constrained to achieve high- resolution reconstruction. Compared with existing digital holography techniques, our approach not only improves the reconstruction resolution but also the reconstruction accuracy. More importantly, our approach can realize fast and robust reconstruction of dynamic objects. Both simulations and experiments have demonstrated the superiority of the proposed approach.