An electrically switchable diffractive optical element has been built based on a computer-generated phase hologram and a liquid-crystal layer. The design of the diffractive optical element and the fabrication and performance of the device are discussed. The application of the device in a machine vision system for optical surface inspection is shown.
© 1994 Optical Society of America
Original Manuscript: August 13, 1993
Published: January 1, 1994
M. Stalder and P. Ehbets, "Electrically switchable diffractive optical element for image processing," Opt. Lett. 19, 1-3 (1994)