Method and apparatus for phase correlation holographic drive
US6909529B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2002 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | May 17, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A holographic storage apparatus for recording data in a holographic medium includes at least one light source for generating a reference beam and a signal beam. The reference beam is preferably a phase beam of unchanging phase content. The apparatus also includes a holographic medium placed in a path of the reference beam and a path of the signal beam. The holographic medium has a first face and both the reference beam and the signal beam enter the holographic medium through the first face. The holographic medium also includes a data reflective surface. The reference beam and the signal beam interfere in the holographic medium to create a hologram only after at least one of the reference beam and the signal beam have reflected off of the data reflective surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.