Apparatus and method for reading and apparatus for reading and writing holograms
US8437060B2 · kind B2 · utility
0Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 2009 |
| Grant date | May 7, 2013 |
| Priority date | — |
| Expiry date | Dec 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for reading and writing holograms from and to a holographic storage medium uses an object beam and a reference beam both having a first coherence length and being guided along separate optical branches of an optical setup to be imaged to the holographic storage medium. The apparatus includes one or more elements for reducing the coherence length of the reference beam to a second coherence length for reading out a hologram from the holographic storage medium, wherein the second coherence length is shorter than the first coherence length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.