Temperature insensitive filter
US11360262B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 31, 2018 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Dec 31, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29326
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An integrated wavelength-selective filter device comprises a first optical element, for directing received radiation into a direction defined by a first angle, and a second optical element being a diffractive element configured for diffracting the directed radiation under a second angle. The second angle is such that for a single reference wavelength the diffracted radiation is directed into a propagation medium for advancing therein towards a predetermined position on the first optical element or on a further optical element for filtering radiation having a wavelength substantially matching the reference wavelength from radiation having a substantially different wavelength. The propagation medium is formed from a material that is different from any material of the substrate of the first and the second optical element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.