Volume holographic memory-based optical information-recording/reproducing apparatus
US6256281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Mar 24, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A volume holographic memory-based optical information-recording/reproducing apparatus being capable of controlling an interference area formed by a reference beam and a signal beam within a recording medium more easily than by waveform shaping using a lens. A recording medium is installed in the apparatus for recording a three-dimensional optical interference pattern formed by at least two coherent light beams as spatial changes in refractive index of the recording medium. A signal beam optical system transmits a coherent signal beam to the recording medium through a Fourier transform lens. A reference beam optical system transmits a coherent reference beam to the recording medium. The reference beam intersects the signal beam within the recording medium, and an angle of intersection between the reference beam and the signal beam is changed. Diffracted light of the reference beam diffracted from the recording medium is detected. Light intensity distribution-offset element is arranged in both of optical paths of the signal and reference beam optical systems, for controlling a distribution of a light intensity of the signal beam and a light intensity of the reference beam, respective…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.