Coherent light modulation and detector
US5153771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1990 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Jul 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/213
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A acousto-optic Fabry-Perot optical modulator (10) has a crystalline body (12) having a first partially reflective electrode (14) for receiving radiation, including laser radiation having a wavelength or wavelengths of interest, and a second, oppositely disposed partially reflective electrode (14) for emitting the received radiation including the laser radiation. The modulator is driven by an alternating source (16) at a resonant frequency of the crystalline body and intensity modulates at the resonant frequency only the emitted laser radiation. A detector (18) is positioned for receiving the emitted radiation, including the intensity modulated laser radiation, and has an output signal expressive of the intensity of the emitted radiation. Signal processing circuitry (20,34) is coupled to the detector output signal and is responsive thereto for identifying the intensity modulated laser radiation for indicating when laser radiation is received by the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.