The reconstruction quality of in-line holography suffers from the superposition of twin images that have different foci but identical information content. We propose a phase retrieval method using two axially displaced holograms and a finite transmission constraint to eliminate the conjugate image. The simulation and experimental results demonstrate a better elimination effect and a faster rate of convergence compared with those of previously reported methods. Two holograms can be recorded simultaneously using two cameras, thus this technique can be used in real-time imaging.
© 2012 Chinese Optics Letters
Lu Rong, Feng Pan, Wen Xiao, Yan Li, and Fanjing Wang, "Twin image elimination from two in-line holograms via phase retrieval," Chin. Opt. Lett. 10, 060902- (2012)