Acousto-optic tunable filter system which radiates a source light beam incident on a surface of the crystal filter body at an oblique angle
US6014245A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a non-collinear type acousto-optic tunable filter, a source light beam is made off-perpendicularly incident on a crystal body, so that the cross section of the source light beam is narrowed within the crystal body. As a result, the receiving angular aperture becomes large to increase the amount of light collected into the crystal body. Consequently, highly accurate spectrometry can be performed even if the intensity of the source light beam is low. Further, the non-diffraction part of the crystal body can be eliminated by the off-perpendicular incidence of the source light beam, so that the sufficient diffraction length of acoustic and optic waves can be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.