Acousto-optic filter
US3953107A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Jul 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An acousto-optic filter utilizing the far-off-axis anisotropic Bragg diffraction comprising an optically anisotropic crystal in which a light beam of incidence travels in a direction making a large angle with the crystalline axis and an ultrasonic wave travels in a predetermined direction. In the acousto-optic filter using a paratellurite crystal, the wavelength of the visible light is tuned by changing the frequency of the ultrasonic wave in a low frequency range below 100 MHz. The ultrasonic power required for driving the acousto-optic filter is about 1/500 that of the so far known acousto-optic filters. The bandwidth of the transmitted light can be changed from several angstroms to several hundred angstroms by selecting the incident angle of the light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.