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Observation of saturation and rapid passage signals in the 10.25 micron spectrum of ethylene using a frequency chirped quantum cascade laser

McCulloch, M. T. and Duxbury, G. and Langford, N. (2006) Observation of saturation and rapid passage signals in the 10.25 micron spectrum of ethylene using a frequency chirped quantum cascade laser. Molecular Physics, 104 (16-17). pp. 2767-2779. ISSN 0026-8976

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Abstract

Rapid passage signals exhibiting saturation effects have been observed when a low-pressure sample of ethylene, within a multiple pass absorption cell, is subjected to radiation from a repetitively pulsed 10.25 micron quantum-cascade laser. Within each pulse the laser frequency sweeps 36GHz from high to low frequency in a time of 140 ns. At the low gas pressures, less than 20 mTorr, in the absorption cell the sweep rate through a Doppler-broadened absorption line (ca. 0.5 ns), is much faster than the collisional relaxation time of the ethylene and this leads to rapid passage effects. Examples are given of the complex rapid passage signals observed in pure and nitrogen broadened spectra. The rapid passage effects, which lead to the variety of the observed signals, have been modelled by numerical solution of the coupled Maxwell-Bloch equations for four sets of two-level systems.

Item type: Article
ID code: 31027
Keywords: semiconductor diode-laser, population transfer, inversion, absorption, adiabatic passage, gases, spectrometer, Plasma physics. Ionized gases, Molecular Biology, Physical and Theoretical Chemistry, Biophysics, Condensed Matter Physics
Subjects: Science > Physics > Plasma physics. Ionized gases
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 21 Jun 2011 11:45
    Last modified: 05 Sep 2014 08:49
    URI: http://strathprints.strath.ac.uk/id/eprint/31027

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