Laser device coupled to a cavity by optical feedback for detecting gas traces
US7450240B2 · kind B2 · utility
31Cited by
13References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 9, 2002 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Jul 4, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device of detection of gas in trace amounts by a semiconductor laser coupled to a resonant optical cavity containing a chemical species to be analyzed. The device comprises a resonant optical cavity containing a chemical species to be analyzed; a semiconductor laser, coupled by optical feedback to the optical cavity and capable of being frequency-scanned; a means for adjusting the laser-cavity coupling rate; a means for finely adjusting the optical feedback phase; and a means for measuring the light transmitted by the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.