Multi-color tunable filter
US4350413A · kind A · utility
4Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Apr 14, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/015
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A semi-conductor multi-color tunable filter is created by multiple epitaxial layers of varying composition. An AC modulation voltage is superimposed on a sweep bias to periodically shift the fundamental absorption edge of each individual epitaxial layer. This arrangement permits a unique voltage to be associated with a particular color. A lock-in filter matches colors observed at a detector with the voltage present for a given observation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.