Sub-Doppler spectra of infrared hyperfine transitions of nitric oxide using a pulse modulated quantum cascade laser: rapid passage, free induction decay, and the ac Stark effect

Geoffrey Duxbury, James F. Kelly, Thomas A. Blake, Nigel Langford

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Using a low power, rapid (nsec) pulse-modulated quantum cascade (QC) laser, collective coherent effects in the 5 mu m spectrum of nitric oxide have been demonstrated by the observation of sub-Doppler hyperfine splitting and also Autler-Townes splitting of Doppler broadened lines. For nitrous oxide, experiments and model calculations have demonstrated that two main effects occur with pulse-modulated (chirped) quantum cascade lasers: free induction decay signals, and signals induced by rapid passage during the laser chirp. In the open shell molecule, NO, in which both Lambda-doubling splitting and hyperfine structure occur, laser field-induced coupling between the hyperfine levels of the two Lambda-doublet components can induce a large ac Stark effect. This may be observed as sub-Doppler structure, field-induced splittings, or Autler-Townes splitting of a Doppler broadened line. These represent an extension of the types of behaviour observed in the closed shell molecule nitrous oxide, using the same apparatus, when probed with an 8 mu m QC laser. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4710542]

Original languageEnglish
Article number174319
Number of pages13
JournalJournal of Chemical Physics
Volume136
Issue number17
DOIs
Publication statusPublished - 7 May 2012

Keywords

  • high-speed optical techniques
  • hyperfine structure
  • infrared spectra
  • nitrogen compounds
  • Stark effect

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