Liquid crystal phase modulator using cholesteric circular polarizers
US5627666A · kind A · utility
50Cited by
13References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1994 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Jul 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/343
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides a phase modulator comprising an electro-optically rotatable smectic liquid crystal half-wave retarder in combination with a cholesteric liquid crystal circular polarizer. Rotation of the half-wave retarder varies the phase delay of the modulator. A polarizing interferometer is provided utilizing the phase modulator of this invention in combination with a second cholesteric circular polarizer and a linear polarizer. A tunable Fabry-Perot resonator which does not require ordinary mirrors is provided utilizing the phase modulator of this invention in combination with a second cholesteric circular polarizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.