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Opt Lett. 2012 Jan 15;37(2):229-31. doi: 10.1364/OL.37.000229.

High-spatial-resolution one-dimensional rotational coherent anti-Stokes Raman spectroscopy imaging using counterpropagating beams.

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Combustion Research Facility, Sandia National Laboratory, Livermore, California 94551, USA.


A counterpropagating phase-matching geometry is employed for high-spatial-resolution one-dimensional (1D) imaging of temperature and O2-to-N2 concentration ratio using picosecond pure-rotational coherent anti-Stokes Raman spectroscopy (RCARS) over a large field (20 mm). A single-shot 1D RCARS image of more than 20 mm in length is thus acquired at 300 K in air. High-resolution 1D RCARS flame measurements are demonstrated using a custom-built burner and a premixed methane/air flame (Φ=0.6). This phase-matching scheme improves the spatial resolution by approximately 1 order of magnitude when compared to the standard small-angle BOXCARS phase-matching schemes typically employed in CARS measurements. Additionally, for a 20 mm 1D image, signal levels are increased by 10(2) because of the higher irradiance provided in the current scheme.


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