A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers

Gianluca Gagliardi, Simone Borri, Filippo Tamassia, Federico Capasso, Claire Gmachl, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 μm, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of 13C/12C, 18O/16O, 17O/16O and 15N/14N isotope ratios.

Original languageEnglish (US)
Pages (from-to)313-321
Number of pages9
JournalIsotopes in Environmental and Health Studies
Issue number4
StatePublished - Dec 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • Inorganic Chemistry
  • Environmental Chemistry


  • Carbon-13
  • IR spectrometry
  • Isotope analysis
  • Isotopomers
  • Methane
  • Nitrogen-15
  • Nitrous oxide
  • Oxygen-17
  • Oxygen-18


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