Volume holographic storage using rotated signal beam encoder
US6040930A · kind A · utility
6Cited by
6References
8Claims
0Family size
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Key dates
| Filing date | May 1, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | May 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The data encoder (e.g. an amplitude spatial light modulator, ASLM) in a volume holographic storage system is rotated by 45.degree. relative to the normal to the plane of the reference and signal beams, such that the near-Fourier transform pattern of the encoder at the medium has an X-shape. The encoder rotation allows tight packing of spatial multiplexing subvolumes in a rectangular array, and provides for uniform spatial frequency filtering in a perpendicular geometry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.