We report the use of a tunable ArF laser at 193.26 nm to record simultaneous single-laser-shot, planar images of molecular hydrogen and hot oxygen in a turbulent H2–air diffusion flame. Excitation spectra of fuel and oxidant-rich flame zones confirm a partial overlap of the two-photon H2 (6,0) Q(1) E, F ← X and single-photon O2 (10,2) R(17) B ← X (Schumann-Runge) absorption bands. UV Rayleigh scattering images of flame structure and estimated detection limits for the H2 two-photon imaging are also presented.
Lempert, W., Diskin, G., Kumar, V., Glesk, I., & Miles, R. (1991). Two-dimensional imaging of molecular hydrogen in H2–air diffusion flames using two-photon laser-induced fluorescence. Optics Letters, 61(9), 660-662. https://doi.org/10.1364/OL.16.000660