Multi-pass etalon filter
US11239626B2 · kind B2 · utility
0Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2019 |
| Grant date | Feb 1, 2022 |
| Priority date | — |
| Expiry date | Jul 31, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/284
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a multi-pass etalon-based optical filter in which input light once reflected from the etalon is returned back to the etalon for a second reflection to enhance etalon contrast. The external mirror may be tilted relative to the etalon so that two planes of incidence are orthogonal. The multi-pass etalon-based optical filter may be used to clean scattered light from an excitation wavelength in Raman and Brillouin spectroscopy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.