Polarization controlling apparatus and polarization operation apparatus
US7535616B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2006 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Jan 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/17
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polarization controlling apparatus includes a permanent magnet itself or a permanent magnet to which a part capable of being magnetized is applied, an electromagnet capable of changing the magnitude of a magnetic field to be generated thereby, and a Faraday rotation effect element. The Faraday rotation effect element is disposed at a position at which an interaction magnetic field acts on the Faraday rotation effect element. The interaction magnetic field is produced by an interaction between a magnetic field generated by the permanent magnet and a magnetic field generated by the electromagnet. The Faraday rotation effect element thereby produces a Faraday rotation effect on inputted light. The magnitude of the interaction magnetic field in the Faraday rotation effect element is varied by a magnetic field component generated by the electromagnet to vary the amount of the Faraday rotation effect to be had on the inputted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.