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Picosecond backward-propagating lasing of atomic hydrogen via femtosecond 2-photon-excitation in a flame

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Abstract

We report on the observation of backward-propagating 656-nm lasing of atomic hydrogen in flame using 205-nm femtosecond laser pulses. It shows a donut-shaped spatial mode and smooth temporal profile, suggesting spatially-resolved measurements in few-millimeters resolution.

© 2018 The Author(s)

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