Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3

J. H. Northern, G. A. D. Ritchie, E. P. Smakman, J. H. van Helden, J. Cockburn, G. Duxbury

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this Letter, a 10 mu m quantum cascade laser operating in the intrapulse mode is used observe rapid passage (RP) effects within a 40 cm single-pass gas cell containing low pressures of NH3. The laser tuning range allows the rotational states J = 2 with K = 0, 1, and 2 to be probed. We show that the RP structures change as a function of optical density and that the magnitude of the delay in the switch from absorption to emission as a function of increased gas pressure is dependent upon the initial value of K. These measurements are qualitatively well modeled using the Maxwell-Bloch equations.
LanguageEnglish
Pages2750-2752
Number of pages3
JournalOptics Letters
Volume35
Issue number16
DOIs
Publication statusPublished - 15 Aug 2010

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optical density
quantum cascade lasers
rotational states
gas pressure
switches
low pressure
tuning
laser beams
cells
gases
lasers

Keywords

  • spectroscopy
  • optics
  • laser radtiation

Cite this

Northern, J. H., Ritchie, G. A. D., Smakman, E. P., van Helden, J. H., Cockburn, J., & Duxbury, G. (2010). Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3. Optics Letters, 35(16), 2750-2752. https://doi.org/10.1364/OL.35.002750
Northern, J. H. ; Ritchie, G. A. D. ; Smakman, E. P. ; van Helden, J. H. ; Cockburn, J. ; Duxbury, G. / Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3. In: Optics Letters. 2010 ; Vol. 35, No. 16. pp. 2750-2752.
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Northern, JH, Ritchie, GAD, Smakman, EP, van Helden, JH, Cockburn, J & Duxbury, G 2010, 'Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3' Optics Letters, vol. 35, no. 16, pp. 2750-2752. https://doi.org/10.1364/OL.35.002750

Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the nu(2) band of NH3. / Northern, J. H.; Ritchie, G. A. D.; Smakman, E. P.; van Helden, J. H.; Cockburn, J.; Duxbury, G.

In: Optics Letters, Vol. 35, No. 16, 15.08.2010, p. 2750-2752.

Research output: Contribution to journalArticle

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