Optical system for the storage of selectively erasable binary data arranged in the form of holographically recorded pages
US4024513A · kind A · utility
27Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jun 26, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F3/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to optical systems for the storage in the form of elementary holograms, of pages of binary data, said elementary hologram being stored in a two-dimensional or three-dimensional photosensitive medium. The system in accordance with the invention makes use of a photosensitive storage medium lending itself to the selective erasure of binary data, and which contains optical phase-shift devices which enable a phase-shift of 0.degree. or 180.degree. to be produced between the object beam and the reference beam depending upon whether it is desired to record or to erase the data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.