Method and phase mask for manufacturing a multi-channel optical grating
US7352931B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2006 |
| Grant date | Apr 1, 2008 |
| Priority date | — |
| Expiry date | Mar 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02138
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for manufacturing a complex multi-channel optical grating using a phase mask is presented. A plurality of sub-gratings is designed, each having an individual spectral response designed to produce one of the channels of the multi-channel grating. The target profile of the grating is determined based on the combination of the index profiles of the individual sub-gratings, the target index profile defining a target spectral response of the multi-channel grating. A modified index profile having a smooth apodization profile but providing the same spectral response as the target index profile, at least within a spectral region of interest, is determined and encoded into the phase mask. The phase mask is then used to photoinduce the grating in a photosensitive medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.