ADIABATIC RAPID PASSAGE AND OTHER NONLINEAR SPECTROSCOPIC EFFECTS IN THE SPECTRA OF NITRIC OXIDE AND METHANE AT $5 {\mu}m$
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Date
2003
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Ohio State University
Abstract
Following rapid passage experiments by McCulloch, Duxbury and Langford using a pulsed down-chirp quantum cascade laser spectrometer, we have extended the method by utilizing a novel system in which short red or blue frequency chirped pulses can applied to specific molecular velocity classes across a Doppler broadened molecular absorption line. The output from the QCL passes through an astigmatic Herriott cell with an effective path length of approximately 100 m. The molecules studied in this way have been nitric oxide and methane. We will describe a variety of nonlinear optical phenomena which can be explored in this way, including adiabatic following and the Autler-Townes effect. The relationship between this selective probing of specific velocity groups of the Doppler broadened lines and the adiabatic passage experiments involving all velocity components will be described.
Description
(PNNL is operated for the US Department of Energy by the Battelle Memorial Institute under contract DE-AC06-76RLO 1830).
Author Institution: Department of Physics, John Anderson Building, University of Strathclyde; Department of Physics, John Anderson Building, Pacific Northwest National Laboratory
Author Institution: Department of Physics, John Anderson Building, University of Strathclyde; Department of Physics, John Anderson Building, Pacific Northwest National Laboratory