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We introduce a novel strategy to acquire CH PLIF images at high repetition rates. A multi-mode pumped optical parametric oscillator (OPO) which produces signal at 431 nm is used for direct excitation of the CH radical.
Time-resolved picosecond pure-rotational coherent anti-Stokes Raman spectroscopy is demonstrated for thermometry and species concentration determination in flames. Time-delaying the probe pulse enables successful suppression of unwanted signals. A theoretical model is under development.
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