The focal depth of an arbitrary image is extended by optimization of the amplitude and phase distributions over the entire image. We propose a general method that takes advantage of a detector’s (possibly nonlinear) response to incident intensity. We demonstrate the method by computer simulations and experimentally, using computer-generated holograms.
© 1995 Optical Society of America
Boaz Salik, Joseph Rosen, and Amnon Yariv, "Nondiffracting images under coherent illumination," Opt. Lett. 20, 1743-1745 (1995)