Method and apparatus for recording an optical grating in a photosensitive medium
US6501883B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2002 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Mar 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12173
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and an apparatus for recording optical gratings in a photosensitive medium are provided. The invention uses a phase mask in combination with a scanning of the recording light beam. The phase mask, or alternatively the photosensitive medium, is translated along a direction parallel to the scanning of the light beam, so that the period of the recorded grating may be locally adjusted. To ensure a proper recording efficiency over a large range, an appropriately selected wavefront curvature is provided in the light beam. The method of the invention is particularly advantageous for the recording of superimposed grating components in a photosensitive medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.