Tunable diffractive subtractive filter
US4251137A · kind A · utility
126Cited by
4References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1978 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Sep 14, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/38
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffractive subtractive filter is made tunable by controllably varying the index of refraction of a fluid medium in contact with a surface relief pattern of a solid diffractive phase medium. A liquid crystal is the preferred fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.