Frequency modulation spectroscopy by means of quantum-cascade lasers

S. Borri, S. Bartalini, P. De Natale, M. Inguscio, Claire F. Gmachl, F. Capasso, D. L. Sivco, A. Y. Cho

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


In this paper we investigate the performance of quantum cascade (QC) lasers for high frequency modulation spectroscopy, particularly using frequency modulation (FM) and two-tone (2T) techniques. The coupling of the rf signal to the QC laser through the cryostat is studied in detail as well as the noise contributions of both the detector and the laser source to the final spectra. The experimental traces are obtained by spectroscopy on low-pressure N 2O and CH4 gases at 8.0 μm and 7.3 μm wavelength, respectively, and reproduce the line profiles predicted by theory. As a preliminary result, an enhancement of a factor six is measured with respect to direct absorption line recording.

Original languageEnglish (US)
Pages (from-to)223-229
Number of pages7
JournalApplied Physics B: Lasers and Optics
Issue number2-3
StatePublished - Nov 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy


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