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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 24 — Dec. 15, 2011
  • pp: 4725–4727

Rapid passage signals from a vibrationally excited target molecule: a pump and probe experiment with continuous wave quantum cascade lasers

R. J. Walker, J. H. van Helden, J. Kirkbride, E. A. McCormack, M. T. Bell, D. Weidmann, and G. A. D. Ritchie  »View Author Affiliations


Optics Letters, Vol. 36, Issue 24, pp. 4725-4727 (2011)
http://dx.doi.org/10.1364/OL.36.004725


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Abstract

Two 5 µm continuous wave quantum cascade lasers are used to perform a counterpropagating pump and probe experiment on a low pressure sample of nitric oxide. The strong pump field excites a fundamental rovibrational transition and the weaker probe field is tuned to the corresponding rotationally resolved hot band transition. When both light fields are in resonance, rapid passage is observed in the hot band absorption lineshape arising from a minimally damped and velocity-selected sample of molecules in the v=1 state. The measured rapid passage signals are well described by a two-level model based on the optical Bloch equations.

© 2011 Optical Society of America

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(300.1030) Spectroscopy : Absorption
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6420) Spectroscopy : Spectroscopy, nonlinear

ToC Category:
Spectroscopy

History
Original Manuscript: July 19, 2011
Manuscript Accepted: August 18, 2011
Published: December 9, 2011

Citation
R. J. Walker, J. H. van Helden, J. Kirkbride, E. A. McCormack, M. T. Bell, D. Weidmann, and G. A. D. Ritchie, "Rapid passage signals from a vibrationally excited target molecule: a pump and probe experiment with continuous wave quantum cascade lasers," Opt. Lett. 36, 4725-4727 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-24-4725


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