Femtosecond coherent anti-Stokes Raman scattering measurement of gas temperatures from frequency-spread dephasing of the Raman coherence

Date
2006-01-01
Authors
Lucht, Robert
Roy, Sukesh
Meyer, Terrence
Gord, James
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Altmetrics
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Research Projects
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Mechanical Engineering
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Abstract

Gas-phase temperatures and concentrations are measured from the magnitude and decay of the initial Raman coherence in femtosecond coherent anti-Stokes Raman scattering (CARS). A time-delayed probe beam is scattered from the Raman polarization induced by pump and Stokes beams to generate CARS signal; the dephasing rate of this initial coherence is determined by the temperature-sensitive frequency spread of the Raman transitions. Temperature is measured from the CARS signal decrease with increasing probe delay. Concentration is found from the ratio of the CARS and nonresonant background signals. Collision rates do not affect the determination of these quantities.

Description

The following article appeared in Applied Physics Letters 89, 251112 (2006): and may be found at doi: 10.1063/1.2410237.

Keywords
anti Stokes Raman scattering, gas temperatures, Raman coherence, temperature sensitive frequency, light polarization, natural frequencies
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