Variable optical filter
US7050216B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 10, 2004 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Dec 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable optical filter comprises a first polarizer, a first phase difference element operable to generate a phase difference, a variable Faraday rotator operable to impart a variable Faraday rotation, a second phase difference element operable to generate a phase difference, and a second polarizer, wherein said polarizers, said variable Faraday rotator, and said phase difference elements are arranged in the mentioned order along the optical axis, and wherein when the angles formed by the optic axes of said first and second phase difference elements and the transmitted polarization azimuth of the first polarizer are assumed respectively to be φ1 and φ2, these φ1 and φ2 are set to different angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.