Acoustic-optic coherent modulator and detection system
US4217036A · kind A · utility
26Cited by
4References
8Claims
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Key dates
| Filing date | Apr 17, 1978 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Apr 17, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The intensity of light beams transmitted through a tunable acousto-optic modulator is controlled by modulating the center wavelength of the filter passband. Such wavelength modulation can be obtained by modulation of the acoustic frequency or the crystal birefringence. An acousto-optic modulator of this type is sensitive to the temporal coherence of the light beam. When used in an optically coherent detection system, it can provide detection of very weak laser beams in the presence of strong incoherent background radiations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.