Optical frequency modulation demodulator
US3979686A · kind A · utility
4Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1975 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Sep 8, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser beam frequency modulation demodulator is disclosed utilizing the highly linear frequency versus voltage characteristic of the absorption resonance provided by a Stark-effect cell. An error signal, generated by dither modulation of the Stark-effect cell voltage, is fed back to the Stark-effect cell via a low-pass filter to cause the absorption resonance to track the instantaneous frequency of the laser beam. The feedback signal applied to the Stark-effect cell has an amplitude proportional to the frequency modulation on the laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.