Chirped laser dispersion spectroscopy with harmonic detection of molecular spectra

M. Nikodem, D. Weidmann, Gerard Wysocki

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Chirped laser dispersion spectroscopy (CLaDS) has been introduced recently as a technique that performs molecular detection based on measurement of optical dispersion. In this paper, a new detection scheme based on chirp modulation (CM) and subsequent phase-sensitive detection is described. CM-CLaDS inherits the full advantages of conventional CLaDS and additionally overcomes some of its limitations. A prototype CM-CLaDS instrument has been developed and characterized in laboratory conditions. The system is based on a distributed feedback quantum cascade laser which operates around 4.52 μm and can probe the most intense nitrous oxide (N2O) ro-vibrational transitions. Preliminary performance tests are presented and provide a path/bandwidth normalized minimum N2O detection limit below 100 ppbv m/Hz 1/2.

Original languageEnglish (US)
Pages (from-to)477-483
Number of pages7
JournalApplied Physics B: Lasers and Optics
Volume109
Issue number3
DOIs
StatePublished - Nov 1 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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