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Actively coupled cavity ringdown spectroscopy with low-power broadband sources |
Optics Express, Vol. 19, Issue 11, pp. 10164-10173 (2011)
http://dx.doi.org/10.1364/OE.19.010164
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Abstract
We demonstrate a coupling scheme for cavity enhanced absorption spectroscopy that makes use of an intracavity acousto-optical modulator to actively switch light into (and out of) a resonator. This allows cavity ringdown spectroscopy (CRDS) to be implemented with broadband nonlaser light sources with spectral power densities of less than 30μW/nm. Although the acousto-optical element reduces the ultimate detection limit by introducing additional losses, it permits absorptivities to be measured with a high dynamic range, especially in lossy environments. Absorption measurements for the forbidden transition of gaseous oxygen in air at ∼760nm are presented using a low-coherence cw-superluminescent diode. The same setup was electronically configured to cover absorption losses from 1.8×10−8cm−1 to 7.5% per roundtrip. This could be of interest in process analytical applications.
© 2011 OSA
OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.4780) Lasers and laser optics : Optical resonators
(300.0300) Spectroscopy : Spectroscopy
(010.1030) Atmospheric and oceanic optics : Absorption
ToC Category:
Spectroscopy
History
Original Manuscript: March 18, 2011
Revised Manuscript: April 29, 2011
Manuscript Accepted: April 29, 2011
Published: May 9, 2011
Citation
Christian Petermann and Peer Fischer, "Actively coupled cavity ringdown spectroscopy with low-power broadband sources," Opt. Express 19, 10164-10173 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-11-10164
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