The application of coherent anti-Stokes Raman scattering (CARS) as a measuring tool in combustion diagnostics is well documented (e.g., Ref. 1).In the first CARS measurements the wavelength of a dye laser at frequency ω s was scanned through the wavelength region of the Stokes Raman band, determined by a fix-frequency laser at ω ρ .The Raman shift of the studied molecule is then given by ω p -ω s = ω R .The CARS signal is generated through the third-order non linear susceptibility χ (3) and observed at ω As = 2ω p -ω s .These early CARS measurements were clearly limited to
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Aldén et al. (1984) studied this question.