It is proposed and experimentally demonstrated that a multilevel or even continuous-level phase-only computergenerated hologram can be realized by use of a binary (two-level) structure. The desired phase shift is invoked by introduction of a lateral dislocation of a high-frequency binary grating within each of the elements that constitute the hologram. An asymmetrically distributed spot array has been generated experimentally, and a uniformity error of 6% and an efficiency of 42% have been measured.
© 1996 Optical Society of America
Ming Li, Anders Larsson, Niklas Eriksson, Mats Hagberg, and Jörgen Bengtsson, "Continuous-level phase-only computer-generated hologram realized by dislocated binary gratings," Opt. Lett. 21, 1516-1518 (1996)