Holographic storage with homodyne detection
US7944793B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 20, 2005 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Aug 11, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24044
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns the field of holographic storage units. More particularly, the invention concerns the field of holographic storage units used for bit-by-bit storage of information. It concerns a method for reading data recorded in a holographic material in the form of a hologram obtained by interference of two beams of substantially the same wavelength, and using at least one reflecting layer. The invention is characterized in that it includes the following steps: emitting a light comprising at least said wavelength at said holographic material comprising said hologram; performing a homodyne detection between the signal resulting from the first light diffracted by said hologram and at least one signal selected between the reflected signal and the signal transmitted by said at least one reflecting layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.