Intensity of a crossover signal relative to Lamb dips observed in Stark spectroscopy of methane

Shoko Okuda, Hiroyuki Sasada

Research output: Contribution to journalArticle

1 Citation (Scopus)


We have observed twelve triplets of two Lamb dips and a crossover signal in Stark spectroscopy of the ν3 band of methane using a comb-referenced sub-Doppler resolution spectrometer. The crossover signal consists of two crossover resonances in the Λ- and V-type three-level systems, which overlap each other in frequency under the first-order Stark shifts (Tyurikov et al., 1997). The intensity of the crossover signal relative to the Lamb dips agrees well with a simple calculation based on steady-state solutions of rate equations in weak saturation using the observed intensity ratio of the Lamb dips in the Λ-type three-level system.

Original languageEnglish
Pages (from-to)10-15
Number of pages6
JournalJournal of Molecular Spectroscopy
Publication statusPublished - 2018 Oct 1



  • Comb spectroscopy
  • Crossover resonance
  • First-order Stark shift
  • Methane
  • Mid infrared
  • Saturated absorption spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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