Abstract
A novel continuous-wave mid-infrared distributed feedback interband cascade laser was utilized to detect and quantify formaldehyde (H2CO) using quartz-enhanced photoacoustic spectroscopy. The laser was operated at liquid-nitrogen temperatures and provided single-mode output powers of up to 12 mW at 3.53 μm (2832.5 cm-1). The noise equivalent (1σ) detection sensitivity of the sensor was measured to be 2.2×10-8 cm-1 W (Hz)-1/2 for H2CO in ambient air, which corresponds to a detection limit of 0.6 parts in 106 by volume (ppmv) for a 10 s sensor time constant and 3.4 mW laser power delivered to the sensor module.
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42.62.Fi; 72.50.+b
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Horstjann, M., Bakhirkin, Y., Kosterev, A. et al. Formaldehyde sensor using interband cascade laser based quartz-enhanced photoacoustic spectroscopy. Appl Phys B 79, 799–803 (2004). https://doi.org/10.1007/s00340-004-1659-3
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DOI: https://doi.org/10.1007/s00340-004-1659-3