Population inversion in fluorescing fragments of super-excited molecules inside an air filament*
See-Leang Chinb), Huai-Liang Xua)†
Fig.#cod#x0A0;5. a Schematic of ASE experiment setup for water vapor measurement and b typical spectrum in the range of 300#cod#x2013;320#cod#x0A0;nm for filament-induced fluorescence of water vapor in air. [ 5 ]