Abstract

We demonstrate that one-dimensional, two-photon laser-induced fluorescence imaging of oxygen atoms in flames can be achieved with reasonable signal intensities and spatial resolution but without the interference caused by the photolysis of O₂, by the use of a beam telescope instead of a focusing lens. The increase in probed volume (and concomitantly the number of excitable atoms) caused by the larger beam diameter in the telescope experiments offsets, to a certain extent, the loss in signal that is due to the reduced laser fluence. Further, the results show that the “correct” dependence of the fluorescence intensity on laser fluence (in this case quadratic) does not guarantee the absence of photochemistry.

© 1993 Optical Society of America

Comparison of nanosecond and picosecond excitation for two-photon laser-induced fluorescence imaging of atomic oxygen in flames

Jonathan H. Frank, Xiangling Chen, Brian D. Patterson, and Thomas B. Settersten
Appl. Opt. 43(12) 2588-2597 (2004)

Photochemical effects in two-photon-excited fluorescence detection of atomic oxygen in flames

J. E. M. Goldsmith
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Detection of nitrogen atoms in flames using two-photon laser-induced fluorescence and investigations of photochemical effects

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Comparison of nanosecond and picosecond excitation for interference-free two-photon laser-induced fluorescence detection of atomic hydrogen in flames

Waruna D. Kulatilaka, Brian D. Patterson, Jonathan H. Frank, and Thomas B. Settersten
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Laser-induced fluorescence detection strategies for sodium atoms and compounds in high-pressure combustors

Karen J. Rensberger Weiland, Michael L. Wise, and Gregory P. Smith
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