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European Quantum Electronics Conference (EQEC)

Phase effects in rapid-passage induced free induction decay of nitrous oxide

S. Wright, GEOFFREY DUXBURY, Nigel Langford

Published Jan 18, 2006• 0 citations
Publisher

Abstract

Free induction decays in nitrous oxide induced by the rapid-passage of a frequency-swept field through a transition are described. For lambda doublets sweep rate dependent coherence effects are observed.
DOI
10.1109/eqec.2005.1567358

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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.