Method and system for optical data storage
US10141018B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2013 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Nov 28, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/00457
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for recording and retrieval of optically readable data employ a recording medium (100) which comprises an optically active material (108) able to induce a change in properties of the medium in the presence of optical radiation having a first characteristic, such as a first optical frequency, and wherein the change in properties can be inhibited by optical radiation having a second characteristic, such as a second optical frequency. During recording, a region of the recording medium (100) is irradiated with a first beam (506) of optical radiation having the first characteristic, the beam having a sufficient intensity within a central portion of the irradiated region and being of sufficient duration to cause an optically induced change in properties of the recording medium. Simultaneously, the region of the recording medium (100) is irradiated with a second beam (508) of optical radiation having the second characteristic, the second beam having a local intensity minimum within the central portion of the irradiated region, and a local intensity maximum in at least one portion of the irradiated region adjacent to the central portion which is sufficient to inhibit …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.