Voigt filter
US5731585A · kind A · utility
9Cited by
16References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1992 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Aug 27, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/118
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A Voigt optical filter. Crossed polarizers are provided at the entrance and exit of a vapor cell continuing an alkali metal vapor. A magnet provides a magnetic field at 90.degree. with the axis of the cell and 45.degree. with each polarizer direction. The only light which passes through the filter is light within a narrow frequency band near the atomic transitions (absorption peaks) of the alkali metal vapor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.