We demonstrate hydrogen (H) atom imaging in high-pressure (1–10 bar) methane-air flames using a home-built, high-conversion-efficiency, direct-frequency-quadrupled fs laser system. The effects of laser energy, excitation wavelength, equivalence ratio, and pressure are discussed.

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Simultaneous NO-LIF, O-TPLIF, and O2-LIF were demonstrated in a flame using a single broadband femtosecond laser. 1D images show species distribution at the flame edge. Equivalence ratio scans agreed with equilibrium calculations and previous measurements.

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