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

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