Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser

Anatoliy A. Kosterev, Frank K. Tittel, Claire F. Gmachl, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, Alfred Y. Cho

Research output: Contribution to journalArticle

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Abstract

A pulsed quantum-cascade distributed feedback laser operating at near room temperature was used for sensitive high-resolution IR absorption spectroscopy of ambient air at a wavelength of ˜8 mm. Neartransform- limited laser pulses were obtained owing to short (˜5-ns) current pulse excitation and optimized electrical coupling. Fast and slow computer-controlled frequency scanning techniques were implemented and characterized. Fast computer-controlled laser wavelength switching was used to acquire second-derivative absorption spectra. The minimum detectable absorption was found to be 3 × 10−4 with 105 laser pulses (20-kHz repetition rate), and 1.7 × 10−4 for 5 × 105 pulses, based on the standard deviation of the linear regression analysis.

Original languageEnglish (US)
Pages (from-to)6866-6872
Number of pages7
JournalApplied Optics
Volume39
Issue number36
DOIs
StatePublished - Dec 20 2000

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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    Kosterev, A. A., Tittel, F. K., Gmachl, C. F., Capasso, F., Sivco, D. L., Baillargeon, J. N., Hutchinson, A. L., & Cho, A. Y. (2000). Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser. Applied Optics, 39(36), 6866-6872. https://doi.org/10.1364/AO.39.006866