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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 12 — Jun. 11, 2007
  • pp: 7357–7366

QEPAS based detection of broadband absorbing molecules using a widely tunable, cw quantum cascade laser at 8.4 μm.

Rafal Lewicki, Gerard Wysocki, Anatoliy A. Kosterev, and Frank. K. Tittel  »View Author Affiliations

Optics Express, Vol. 15, Issue 12, pp. 7357-7366 (2007)

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Detection of molecules with wide unresolved rotational-vibrational absorption bands is demonstrated by using Quartz Enhanced Photoacoustic Spectroscopy and an amplitude modulated, high power, thermoelectrically cooled quantum cascade laser operating at 8.4 μm in an external cavity configuration. The laser source exhibits single frequency tuning of 135 cm-1 with a maximum optical output power of 50 mW. For trace-gas detection of Freon 125 (pentafluoroethane) at 1208.62 cm-1 a normalized noise equivalent absorption coefficient of NNEA=2.64×10-9 cm-1∙W/Hz1/2 was obtained. Noise equivalent sensitivity at ppbv level as well as spectroscopic chemical analysis of a mixture of two broadband absorbers (Freon 125 and acetone) with overlapping absorption spectra were demonstrated.

© 2007 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6430) Spectroscopy : Spectroscopy, photothermal

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 19, 2007
Revised Manuscript: May 24, 2007
Manuscript Accepted: May 24, 2007
Published: May 31, 2007

Rafal Lewicki, Gerard Wysocki, Anatoliy A. Kosterev, and Frank K. Tittel, "QEPAS based detection of broadband absorbing molecules using a widely tunable, cw quantum cascade laser at 8.4 μm," Opt. Express 15, 7357-7366 (2007)

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  1. S. Blaser, D. Yarekha, L. Hvozdara, Y. Bonetti, A. Muller, M. Giovannini, and J. Faist, "Room-temperature, continuous-wave, single-mode quantum-cascade lasers at λ≈5.4 µm," Appl. Phys. Lett. 86, 041109 (2005). [CrossRef]
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  10. M. C. Phillips, T. L. Myers, M. D. Wojcik, and B. D. Cannon, "External cavity quantum cascade laser for quartz tuning fork photoacoustic spectroscopy of broad absorption features," Opt. Lett. 32, 1177-1179 (2007). [CrossRef] [PubMed]
  11. L. Diehl, D. Bour, S. Corzine, J. Zhu, G. Hofler, M. Loncar, M. Troccoli and Federico Capasso, "High-power quantum cascade lasers grown by low-pressure metal organic vapor-phase epitaxy operating in continuous wave above 400 K," Appl. Phys. Lett. 88, 201115 (2006). [CrossRef]
  12. A. A. Kosterev, Yu. A. Bakhirkin, R. F. Curl, and F. K. Tittel, "Quartz-enhanced photoacoustic spectroscopy," Opt. Lett. 27, 1902-1904 (2002). [CrossRef]
  13. A. A. Kosterev, F. K. Tittel, D. Serebryakov, A. Malinovsky and A. Morozov, "Applications of quartz tuning fork in spectroscopic gas sensing," Rev. Sci. Instrum. 76, 043105 (2005). [CrossRef]
  14. M. D. Wojcik, M. C. Phillips, B. D. Cannon, M. S. Taubman, "Gas-phase photoacoustic sensor at 8.41 µm using quartz tuning forks and amplitude-modulated quantum cascade lasers," Appl. Phys. B 85, 307-313 (2006). [CrossRef]
  15. C. Y. Wang, L. Diehl, A. Gordon, C. Jirauschek, F. X. Kärtner, A. Belyanin, D. Bour, S. Corzine, G. Höfler, M. Troccoli, J. Faist, and F. Capasso, "Coherent instabilities in a semiconductor laser with fast gain recovery," Phys. Rev. A 75, 031802(R) (2007). [CrossRef]
  16. G. Wysocki, et.al "High power continues wave broadly tunable external cavity quantum cascade laser operating at 8.4 μm for high resolution molecular spectroscopy," to be published.
  17. R. Lewicki, G. Wysocki, A. A. Kosterev, and F. K. Tittel, "Carbon Dioxide and ammonia detection using 2µm diode laser based quartz-enhanced photoacoustic spectroscopy," Appl. Phys. B 87, 157-162 (2007). [CrossRef]
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  20. G. Wysocki, A. A. Kosterev, and F. K. Tittel, "Spectroscopic trace-gas sensor with rapidly scanned wavelengths of a pulsed quantum cascade laser for in situ NO monitoring of industrial exhaust systems," Appl. Phys. B 80, 617-625 (2005). [CrossRef]

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