Method and apparatus for recording to and reading from a diffractive optics memory using symmetrical angular encoding
US7048190B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2002 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Mar 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08564
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an apparatus and method for reading information from and recording information to a diffractive optics memory using symmetrical angular encoding. A coherent light source is split to form an object beam and a corresponding reference beam. An optical axis is defined by the object beam being aligned perpendicular to a plane of the diffractive optics memory. A steering mirror is configured to direct the reference beam received from the coherent light source to the memory. A first plurality of mirrors arranged around one side of the optical axis receives the reference beam from the steering mirror and directs the reference beam at a first angle towards the memory. A second plurality of mirrors arranged around the symmetrical side of the optical axis receives the reference beam from the steering mirror and directs the reference beam at a second angle towards the memory. The first angle is identical to the second angle but formed on the symmetrical side of the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.