Frequency stabilization of CO laser using RF optogalvanic Lamb-dip

The Lamb dip of CO rovibrational transition is detected by a room temperature extracavity RF optogalvanic cell and employed to stabilize the frequency of a CO laser. The S/N ratio of optogalvanic signal is about 2000  at optical power < 1 W. The relative depth of Lamb dip is 2.3%. The S/N ratios...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2009-07, Vol.96 (1), p.111-117
Main Authors: Lien, Y.-H., Liu, D.-K., Shy, J.-T.
Format: Article
Language:English
Subjects:
Biological and medical applications
Carbon monoxide
Coiling
Dipping
Engineering
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gas lasers including excimer and metal-vapor lasers
Harmonics
Lamb
Laser spectroscopy
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Radio frequencies
Signal to noise ratio
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Summary:The Lamb dip of CO rovibrational transition is detected by a room temperature extracavity RF optogalvanic cell and employed to stabilize the frequency of a CO laser. The S/N ratio of optogalvanic signal is about 2000  at optical power < 1 W. The relative depth of Lamb dip is 2.3%. The S/N ratios of first and third harmonic demodulated saturation signals are about 40  and 10  , respectively. The CO laser is stabilized using the first harmonic demodulated signal, and the frequency stability is better than 300 kHz. Concurrently, the influences of operational parameters, which include the coil current, partial pressures of gas mixture, are investigated. A simple model for the influence of coil current is presented, and further improvements are addressed as well.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-008-3349-z