3-D Optical Memory Disk.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1995
- Accession Number
- ADA305575
Entities
People
- Demitri Psaltis
Organizations
- California Institute of Technology