title: Periodically refreshed multiply exposed photorefractive holograms.
abstract: 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.
authors.forename: D
authors.initials: D
authors.lastname: Brady
authors.forename: K
authors.initials: K
authors.lastname: Hsu
authors.forename: D
authors.initials: D
authors.lastname: Psaltis