title: Duplication of phase key for random-phase-encrypted volume holograms.
abstract: Holographic memory encrypted by an optical random-phase key and decrypted by either the original phase key or a duplicate key is proposed and demonstrated. The duplicate key is made by recording the encryption wave front with angle multiplexing during writing of the hologram. The amount of three-dimensional shifting that is tolerable in the duplicate key is analyzed.
authors.affiliation: Graduate Program in Electro-Optical Engineering, Tatung University, Taipei 104, Taiwan.
authors.forename: Wei-Chia
authors.initials: WC
authors.lastname: Su
authors.forename: Ching-Cherng
authors.initials: CC
authors.lastname: Sun
authors.forename: Yu-Cheng
authors.initials: YC
authors.lastname: Chen
authors.forename: Yueh
authors.initials: Y
authors.lastname: Ouyang