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

The Journal of Chemical Physics
Geoffrey DuxburyNigel Langford

Abstract

Using a low power, rapid (nsec) pulse-modulated quantum cascade (QC) laser, collective coherent effects in the 5 μm 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 Λ-doubling splitting and hyperfine structure occur, laser field-induced coupling between the hyperfine levels of the two Λ-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 μm QC laser.

References

Mar 27, 2003·Optics Letters·E NormandN Langford
Apr 22, 1994·Science·J FaistA Y Cho
Jun 20, 1995·Applied Optics·J B McManusM S Zahniser
May 16, 2012·The Journal of Chemical Physics·Geoffrey DuxburyNigel Langford

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Citations

Jan 17, 2013·Physical Chemistry Chemical Physics : PCCP·James M R KirkbrideGrant A D Ritchie
Feb 12, 2014·The Journal of Chemical Physics·James M R KirkbrideGrant A D Ritchie
May 16, 2012·The Journal of Chemical Physics·Geoffrey DuxburyNigel Langford
May 6, 2019·Optics Express·Xiutao LouYongkang Dong

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Methods Mentioned

BETA
NMR

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