Apparatus for holographic data storage
US5995251A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jul 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.