Open path atmospheric spectroscopy using room temperature operated pulsed quantum cascade laser

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
M TaslakovH van den Bergh

Abstract

We report the application of a distributed feedback quantum cascade laser for 5.8 km long open path spectroscopic monitoring of ozone, water vapor and CO(2). The thermal chirp during a 140 or 200 ns long excitation pulse is used for fast wavelength scanning. The fast wavelength scanning has the advantage of the measured spectra not being affected by atmospheric turbulence, which is essential for long open path measurements. An almost linear tuning of about 0.6 and 1.2 cm(-1) is achieved, respectively. Lines from the nu(3) vibrational band of the ozone spectra centered at 1,031 and 1,049 cm(-1) is used for ozone detection by differential absorption. The lowest column densities (LCD) for ozone of the order of 0.3 ppmm retrieved from the absorption spectra for averaging times less than 20s are better then the LCD value of 2 ppmm measured with UV DOAS systems. The intrinsic haze immunity of mid-IR laser sources is an additional important advantage of mid-IR open path spectroscopy, compared with standard UV-vis DOAS. The third major advantage of the method is the possibility to measure more inorganic and organic atmospheric species compared to the UV-vis DOAS.

References

Oct 2, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·P WerleA Popov
Oct 2, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·R KormannV Wagner
Oct 2, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Stéphane SchiltPhilippe A Robert
Mar 27, 2003·Optics Letters·E NormandN Langford
Apr 22, 1994·Science·J FaistA Y Cho
Nov 28, 2007·Optics Letters·D HofstetterM W Sigrist

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Citations

Sep 1, 2006·Photomedicine and Laser Surgery
Jan 1, 2011·Analytical Methods : Advancing Methods and Applications·Ana GonzalvezSergio Armenta

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