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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 36 — Dec. 20, 2006
  • pp: 9221–9229

Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 1.57 μm: new sensitivity limits for absorption measurements in passive optical cavities

Gregory S. Engel, Walter S. Drisdell, Frank N. Keutsch, Elisabeth J. Moyer, and James G. Anderson  »View Author Affiliations


Applied Optics, Vol. 45, Issue 36, pp. 9221-9229 (2006)
http://dx.doi.org/10.1364/AO.45.009221


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Abstract

A robust absorption spectrometer using the off-axis integrated cavity output spectroscopy (ICOS) technique in a passive cavity is presented. The observed sensitivity, conceptually the detection threshold for the absorption cross section ( cm 2 ) multiplied by the concentration ( cm 3 ) and normalized by the averaging time, is measured to be 1.9 × 10 12 ( 1 / cm Hz ) . This high sensitivity arises from using the optical cavity to amplify the observed path length in the spectrometer while avoiding cavity resonances by careful design of the spot pattern within the cavity. The instrument is ideally suited for routine monitoring of trace gases in the near-infrared region. A spectrum showing ambient carbon monoxide at 1.57 μm is presented.

© 2006 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers

History
Original Manuscript: March 15, 2006
Revised Manuscript: August 22, 2006
Manuscript Accepted: September 1, 2006

Citation
Gregory S. Engel, Walter S. Drisdell, Frank N. Keutsch, Elisabeth J. Moyer, and James G. Anderson, "Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 1.57 μm: new sensitivity limits for absorption measurements in passive optical cavities," Appl. Opt. 45, 9221-9229 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-36-9221

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