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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 24 — Aug. 20, 2000
  • pp: 4436–4443

Difference-frequency-based tunable absorption spectrometer for detection of atmospheric formaldehyde

David G. Lancaster, Alan Fried, Bryan Wert, Bruce Henry, and Frank K. Tittel  »View Author Affiliations


Applied Optics, Vol. 39, Issue 24, pp. 4436-4443 (2000)
http://dx.doi.org/10.1364/AO.39.004436


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Abstract

High-sensitivity detection of formaldehyde (CH2O) at 3.5315 µm (2831.64 cm-1) is reported with a diode-laser-pumped, fiber-coupled, periodically poled LiNbO3 spectroscopic source. This source replaced the Pb–salt diode laser Dewar assembly of an existing tunable diode-laser absorption spectrometer designed for ultrasensitive detection of CH2O. Spectra are recorded with 2f-modulation spectroscopy and zero-air rapid background subtraction. Initial measurements reported here, determined from multiple measurements of a flowing 7.7 parts per billion by volume (ppbv, parts in 109) CH2O in air mixture, indicate replicate precisions as low as 0.24 ppbv.

© 2000 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(190.2620) Nonlinear optics : Harmonic generation and mixing
(300.6340) Spectroscopy : Spectroscopy, infrared

History
Original Manuscript: December 22, 1999
Revised Manuscript: May 26, 2000
Published: August 20, 2000

Citation
David G. Lancaster, Alan Fried, Bryan Wert, Bruce Henry, and Frank K. Tittel, "Difference-frequency-based tunable absorption spectrometer for detection of atmospheric formaldehyde," Appl. Opt. 39, 4436-4443 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-24-4436

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