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]

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

Fingerprint

Stark effect
Quantum cascade lasers
quantum cascade lasers
nitric oxide
induction
Nitric Oxide
Nitrous Oxide
Infrared radiation
decay
pulses
nitrous oxides
Molecules
Lasers
chirp
hyperfine structure
lasers
molecules
Experiments

Keywords

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

Cite this

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

In: Journal of Chemical Physics , Vol. 136, No. 17, 174319, 07.05.2012.

Research output: Contribution to journalArticle

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AB - 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]

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