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Optics Letters

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  • Vol. 25, Iss. 16 — Aug. 15, 2000
  • pp: 1162–1164

Quantitative gas sensing by backscatter-absorption measurements of a pseudorandom code modulated λ ~ 8-µm quantum cascade laser

C. M. Gittins, E. T. Wetjen, C. Gmachl, F. Capasso, A. L. Hutchinson, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho  »View Author Affiliations


Optics Letters, Vol. 25, Issue 16, pp. 1162-1164 (2000)
http://dx.doi.org/10.1364/OL.25.001162


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Abstract

We have demonstrated quantitative chemical vapor detection with a multimode quantum cascade (QC) laser. Experiments incorporated pseudorandom code (PRC) modulation of the laser intensity to permit sensitive absorption measurements of isopropanol vapor at 8.0µ . The demonstration shows the practicality of one technical approach for implementing low-peak-power QC lasers in the transmitter portion of a differential absorption lidar (DIAL) system. With a 31-chip, 300-ns/chip PRC sequence, the measured isopropanol detection limit was 12 parts in 106 by volume times meters (~3×10-3 absorption) for a simple backscatter-absorption measurement configuration.

© 2000 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(280.1910) Remote sensing and sensors : DIAL, differential absorption lidar

Citation
C. M. Gittins, E. T. Wetjen, C. Gmachl, F. Capasso, A. L. Hutchinson, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, "Quantitative gas sensing by backscatter-absorption measurements of a pseudorandom code modulated λ ~ 8-µm quantum cascade laser," Opt. Lett. 25, 1162-1164 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-16-1162


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References

  1. F. Capasso, C. Gmachl, D. L. Sivco, and A. Y. Cho, Phys. World 12(6), 27 (1999).
  2. F. Capasso, A. Tredicucci, C. Gmachl, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, IEEE J. Sel. Top. Quantum Electron. 5, 792 (1999), and references therein.
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  5. J. F. Holmes and B. J. Rask, Proc. SPIE 2222, 20 (1994).
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  7. P. L. Hanst, S. T. Hanst, and G. M. Williams, Infrared Spectra for Quantitative Analysis of Gases (Infrared Analysis, Anaheim, Calif., 1995).

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