Femtosecond, two-photon, planar laser-induced fluorescence of carbon monoxide in flames

Abstract

Two-photon, planar laser-induced fluorescence (TP-PLIF) of carbon monoxide was performed in steady and driven flames using femtosecond (fs) laser pulses at 1 kHz. Excitation radiation at 230.1 nm (full-width at half-maximum bandwidth of $270{\mathrm{cm}}^{-1}$) was used to pump many rovibrational two-photon transitions in the $B^1{\sum }^{+}\leftarrow X^1{\sum }^{+}$ system. Visible fluorescence in the range 362–516 nm was captured using an image intensifier and high-speed camera. The signal dependence on excitation energy and wavelength is presented. Photolytic interferences from the ultraviolet laser were explored in a sooting diffusion flame. Using an excitation laser intensity of $10^{10}\mathrm{W}/{\mathrm{cm}}^2$, negligible photolytic interferences were observed, and PLIF imaging of dynamic flame events was performed at 1 kHz.

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