Volume holographic memory and optical information recording/reproducing apparatus
US6594220B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1999 |
| Grant date | Jul 15, 2003 |
| Priority date | — |
| Expiry date | Sep 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A volume holographic memory for recording three-dimensional distribution of interference fringes generated owing to interference between signal light and reference light is provided, wherein the volume holographic memory is formed into a cylindrical shape. Also an optical information recording/reproducing apparatus is provided which incorporates an interference-fringe generating unit for generating interference fringes formed owing to interference between signal light and reference light; a storage unit for storing three-dimensional distribution of the interference fringes generated by the interference-fringe generating unit; a detecting unit for detecting diffracted light obtainable from the storage unit by irradiating the storage unit with reference light; and a reproducing unit for reproducing signal light from diffracted light detected by the detecting unit, wherein the storage unit is constituted by a volume holographic memory having a cylindrical shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.