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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 11 — May. 23, 2011
  • pp: 10164–10173

Actively coupled cavity ringdown spectroscopy with low-power broadband sources

Christian Petermann and Peer Fischer  »View Author Affiliations


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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