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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 13 — May. 1, 2011
  • pp: 1915–1924

Extremely sensitive detection of NO 2 employing off-axis integrated cavity output spectroscopy coupled with multiple-line integrated absorption spectroscopy

Gottipaty N. Rao and Andreas Karpf  »View Author Affiliations

Applied Optics, Vol. 50, Issue 13, pp. 1915-1924 (2011)

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We report on the development of a new sensor for NO 2 with ultrahigh sensitivity of detection. This has been accomplished by combining off-axis integrated cavity output spectroscopy (OA-ICOS) (which can provide large path lengths of the order of several kilometers in a small volume cell) with multiple-line integrated absorption spectroscopy (MLIAS) (where we integrate the absorption spectra over a large number of rotational–vibrational transitions of the molecular species to further improve the sensitivity). Employing an external cavity quantum cascade laser operating in the 1601 1670 cm 1 range and a high-finesse optical cavity, the absorption spectra of NO 2 over 100 transitions in the R band have been recorded. From the observed linear relationship between the integrated absorption versus concentration of NO 2 and the standard deviation of the integrated absorption signal, we report an effective sensitivity of detection of approximately 28 ppt (parts in 10 12 ) for NO 2 . To the best of our knowledge, this is among the most sensitive levels of detection of NO 2 to date.

© 2011 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: November 24, 2010
Revised Manuscript: February 14, 2011
Manuscript Accepted: February 16, 2011
Published: April 28, 2011

Virtual Issues
Vol. 6, Iss. 6 Virtual Journal for Biomedical Optics

Gottipaty N. Rao and Andreas Karpf, "Extremely sensitive detection of NO2 employing off-axis integrated cavity output spectroscopy coupled with multiple-line integrated absorption spectroscopy," Appl. Opt. 50, 1915-1924 (2011)

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