Holographic memory and optical information recording and reproducing apparatus using the same
US6301028A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2000 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Mar 23, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2223/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A description is provided of an optical information recording and reproducing apparatus employing a holographic memory. The apparatus includes a mask disposed in an optical path of the signal light beam so as to cover a light intensity distribution of the signal light beam incident into the holographic memory at nearly a half portion thereof with respect to the center of the distribution of the zeroth-order diffracted light of the signal light beam. The center of a region of the holographic memory where the signal light beam and the reference light beam intersect with each other, is shifted by a distance substantially equal to twice the distance between peaks of the zeroth-order diffracted light or the first-order diffracted light of the signal light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.