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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 67, Iss. 12 — Dec. 1, 2013
  • pp: 1368–1375

Toward Stand-Off Open-Path Measurements of NO and NO2 in the Sub-Parts Per Million Meter Range Using Quantum Cascade Lasers (QCLs) in the Intra-Pulse Absorption Mode

Christoph Reidl-Leuthner and Bernhard Lendl

Applied Spectroscopy, Vol. 67, Issue 12, pp. 1368-1375 (2013)


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Abstract

Two thermoelectrically cooled mid-infrared distributed feedback quantum cascade lasers operated in pulsed mode have been used for the quasi-simultaneous determination of NO and NO2 in the sub-parts per million meter (sub-ppm-m) range. Using a beam splitter, the beams of the two lasers were combined and sent to a retro-reflector. The returned light was recorded with a thermoelectrically cooled mercury cadmium telluride detector with a rise time of 4 ns. Alternate operation of the lasers with pulse lengths of 300 ns and a repetition rate of 66 kHz allowed quasi-simultaneous measurements. During each pulse the laser temperature increased, causing a thermal chirp of the laser line of up to 1.3 cm−1. These laser chirps were sufficient to scan rotational bands of NO centered at 1902 cm−1 and NO2 located at 1632 cm−1. In that way an absorption spectrum could be recorded from a single laser pulse. Currently achieved limits of detection are 600 parts per billion meter (ppb-m) for NO and 260 ppb-m for NO2 using signal averaging over 1 min. This work presents the first steps toward a portable stand-off, open-path instrument that uses thermoelectrically cooled detector and lasers.

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Citation
Christoph Reidl-Leuthner and Bernhard Lendl, "Toward Stand-Off Open-Path Measurements of NO and NO2 in the Sub-Parts Per Million Meter Range Using Quantum Cascade Lasers (QCLs) in the Intra-Pulse Absorption Mode," Appl. Spectrosc. 67, 1368-1375 (2013)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-67-12-1368


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