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

by: D. G. Lancaster, A. Fried, B. Wert, B. Henry, F. K. Tittel
Applied optics, Vol. 39, No. 24. (20 August 2000), pp. 4436-4443  Key: citeulike:11461497

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Abstract

High-sensitivity detection of formaldehyde (CH2O) at 3.5315 micrometers (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 10(9)) CH2O in air mixture, indicate replicate precisions as low as 0.24 ppbv.


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