Abstract
Coherent Raman spectroscopies were proposed by She et al.,1 in 1980 as a nonintrusive and direct method for measuring high-speed molecular flows- Shortly, thereafter, subsonic speed measurements In a N2 flow using stimulated Raman gain spectroscopy (SRGS) were demonstrated by Herring et al.2 At the same time, Gustafson et al.3 used coherent anti-Stokes Raman spectroscopy (CARS) to measure flow velocity in a supersonic CH4 jet. Although N2 is a much weaker Raman scatterer than CH4, experiments with N2 are of particular interest due to the direct applicability to measurements in wind tunnels.
© 1983 Optical Society of America
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