Accession Number : ADA305575

Title :   3-D Optical Memory Disk.

Descriptive Note : Final technical rept. 1 Jul 92-31 Dec 95,

Corporate Author : CALIFORNIA INST OF TECH PASADENA DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Psaltis, Demitri

PDF Url : ADA305575

Report Date : 31 DEC 1995

Pagination or Media Count : 41

Abstract : Holographic 3-D disks were investigated and experimentally demonstrated. The storage density of holographic disks was theoretically calculated to be in excess of 100 bits per micron squared for media that are approximately 4 mm thick. An experimental demonstration of a system with density equal to 10 bits per micron squared was demonstrated with error free data retrieval in a 100 micron thick photopolymer film. The alignment sensitivity of holographic disks was systematically investigated and it was shown that Fourier Fresnel plane storage is generally preferrable in this respect. Two new multiplexing methods were developed. The first, peristrophic multiplexing, augments the storage density achievable with angle multiplexing by a factor approximately equal to 4. The second multiplexing method we developed is shift multiplexing in which the rotation of the disk is conveniently used to access multiplexed holograms, making the design of the overall holographic disk system particularly simple.

Descriptors :   *HOLOGRAPHY, *OPTICAL STORAGE, *DISK RECORDING SYSTEMS, SHIFTING, POLYMERIC FILMS, HIGH DENSITY, INFORMATION RETRIEVAL, MULTIPLEXING.

Subject Categories : Recording and Playback Devices
      Holography
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE