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ERE-CARS signals for six different Raman transitions at 300 K: , , , , , and . The UV probe frequency was fixed at , , , , , and , corresponding to , , , , , and electronic transitions in the band within the electronic system of NO.
Single-shot ERE-CARS signal of NO at various distances away from fuel nozzle in the counterflow diffusion flame at 1 atm. The frequency of the probe beam was fixed at , corresponding to the transition in the band within the electronic system of NO. The analyzing polarizer was intentionally tuned so as to leak a portion of the nonresonant four-wave-mixing signal.
Comparison between measured broadband ERE-CARS signal using four different Raman transitions and the calculated (OPPDIF) NO concentration profile for the same counterflow diffusion flame. Also shown is the comparison between calculated temperature and measured temperature profile in a separate dual-pump CARS experiment.
Histogram of square root for ratio of integrated ERE-CARS signal and nonresonant four-wave-mixing signal for 1000 single-shot spectra acquired at a distance of 10.7 mm from the fuel nozzle for the same flame as described in Fig. 2. The ERE-CARS signal was integrated approximately over the resonant line above the sloping baseline ; the nonresonant four-wave-mixing signal was integrated over approximately located away from the resonant peak . The energy levels for the pump, Stokes, and probe beams were 64, 43, and 1.0 mJ/pulse, respectively. The frequency of the probe beam was fixed at , corresponding to the transition in the band within the electronic system of NO.
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