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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 4 — Feb. 1, 2011
  • pp: A74–A85

Dual quantum cascade laser trace gas instrument with astigmatic Herriott cell at high pass number

J. Barry McManus, Mark S. Zahniser, and David D. Nelson  »View Author Affiliations


Applied Optics, Vol. 50, Issue 4, pp. A74-A85 (2011)
http://dx.doi.org/10.1364/AO.50.000A74


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Abstract

We have developed and demonstrated a high-sensitivity trace gas instrument employing two mid- infrared quantum cascade lasers and an astigmatic Herriott sample cell with up to a 240 m path length. Several aspects of astigmatic Herriott cell optics have been addressed to enable operation at a high pass number (up to 554), including aberrations and pattern selection to minimize interference fringes. The new instrument design, based on the 200 m cell, can measure various atmospheric trace gases, depending on the installed lasers, with multiple trace gases measured simultaneously. Demonstrated concentration noise levels ( 1 s average) are 40 parts per trillion [(ppt) 10 12 ] for formaldehyde, 10 ppt for carbonyl sulfide, 110 ppt for hydrogen peroxide ( H 2 O 2 ), and 180 ppt for nitrous acid (HONO). High-precision measurements of nitrous oxide and methane have been recorded at the same time as high-sensitivity measurements of HONO and H 2 O 2 .

© 2011 Optical Society of America

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.4780) Lasers and laser optics : Optical resonators
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:
LASER APPLICATIONS TO CHEMICAL, SECURITY, AND ENVIRONMENTAL ANALYSIS

History
Original Manuscript: August 4, 2010
Manuscript Accepted: September 13, 2010
Published: December 20, 2010

Citation
J. Barry McManus, Mark S. Zahniser, and David D. Nelson, "Dual quantum cascade laser trace gas instrument with astigmatic Herriott cell at high pass number," Appl. Opt. 50, A74-A85 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-4-A74

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