Femtosecond two-photon-excited backward lasing of atomic hydrogen in a flame

Optics Letters
Pengji DingJoakim Bood

Abstract

We report on an observation of bi-directional 656 nm lasing action of atomic hydrogen in a premixed CH4/air flame induced by resonant femtosecond 205 nm two-photon excitation. In particular, the backward-propagating lasing pulse is characterized in the spatial and temporal domains for the sake of a single-ended diagnostic. Its picosecond-scale duration and smooth temporal profile enable spatially resolved detection of hydrogen atoms in the millimeter range, which is successfully demonstrated using two narrow welding flames.

References

Jan 29, 2011·Science·Arthur DogariuRichard B Miles
Feb 8, 2011·Proceedings of the National Academy of Sciences of the United States of America·Philip R HemmerMarlan O Scully
Jan 3, 2015·Physical Review Letters·Alexandre LaurainPavel Polynkin
Oct 10, 2015·Physical Review Letters·Yi LiuAndré Mysyrowicz
May 4, 2016·Optics Express·Arthur Dogariu, Richard B Miles

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