Fabry-Perot optical filters
US5287214A · kind A · utility
32Cited by
16References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2766
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Simple polarization independent wavelength tuning components (filters) employ a filter element, such as a Fabry-Perot etalon element, which is such that light input thereto undergoes two element transitions with orthogonal polarization states before being output, in order to suppress polarization noise. The element may be mounted for rotation about a single axis. In one arrangement, two etalon filters (20, 21), are separated by a half wave plate (22) providing the necessary polarization rotation. The two etalon filters and the half wave plate comprise a single element rotatable about the single axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.