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.
作者： Geoffrey Duxbury , James F. Kelly , Thomas A. Blake , Nigel Langford
DOI: 10.1063/1.4710542
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摘要: 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 observation sub-Doppler hyperfine splitting and also Autler-Townes Doppler broadened lines. For nitrous oxide, experiments model calculations that two main occur with (chirped) lasers: free induction decay signals, signals induced passage during laser chirp. In open shell molecule, NO, which both Λ-doubling structure occur, field-induced coupling between levels Λ-doublet components can induce large ac Stark effect. This may be observed as structure, splittings, or line. These represent an extension types behaviour closed molecule using same apparatus, when probed 8 QC laser.
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