The feasibility of on-axis synthetic near-field amplitude holograms for three-dimensional display applications is demonstrated. An iterative optimization algorithm is used that generates an object-dependent diffuser that utilizes the phase and, to some extent, amplitude freedoms in the reconstruction plane. The discrimination between twin images and undiffracted terms is thus improved. The on-axis approach presents important advantages: a low coherence requirement for the illuminating source, a lower spacebandwidth and higher viewing angle than with the off-axis alternatives. Defocusing and parallax are experimentally attained with an extended white-light source and a lensless setup.
© 1997 Optical Society of America
Rafael Piestun, Joseph Shamir, Bernhard Weßkamp, and Olof Bryngdahl, "On-axis computer-generated holograms for three-dimensional display," Opt. Lett. 22, 922-924 (1997)