Hologram recording medium, hologram recording method and hologram recording and reproducing apparatus
US6862120B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2002 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Mar 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0009
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a recording medium having a shape of parallel flat plates, the signal light beam and the recording reference light beam cross each other within the recording medium, and a gate light beam having a second wavelength for revealing recording sensitivity of the recording medium is simultaneously irradiated to the recording medium so as to pass through a portion of the recording reference light beam and demarcate a volume smaller than that of this crossing portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.