Generalized dual-plane digital holographic imaging method

• In our generalized dual-plane digital holographic technique, the holograms can be recorded by both on-axis and off-axis geometry. There is no strictly limitation by angle between the object beam and the reference beam during the recording of holograms.
• The twin image and the DC terms can be eliminated by our method. High resolution reconstruction is achieved even with a very small offset angle of the reference beam.

A generalized dual-plane technique for digital holographic imaging is proposed. Two holograms are recorded at two slightly displaced planes. The complex amplitude of the plane reference wave is obtained according to the measured intensity of the reference beam and the spectrum of hologram. The holograms are modified with the known information of the reference wave. Then, the modified holograms are reconstructed by the dual-plane algorithm. The zero-order and the twin images are removed in the reconstructed image. The simulation and experiments demonstrate that this method is valid for both on-axis and off-axis digital holography and high resolution reconstruction is achieved even with a very small offset angle of the reference beam.