We describe a method for increasing the diffraction efficiency of multiply exposed photorefractive holograms by periodic copying. The method is experimentally demonstrated with photorefractive and thermoplastic recording media.
© 1990 Optical Society of America
Original Manuscript: June 12, 1989
Manuscript Accepted: April 19, 1990
Published: July 15, 1990
David Brady, Ken Hsu, and Demetri Psaltis, "Periodically refreshed multiply exposed photorefractive holograms," Opt. Lett. 15, 817-819 (1990)