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Backward nitrogen lasing actions induced by femtosecond laser filamentation: influence of duration of gain
Ist Teil von
New journal of physics, 2015-07, Vol.17 (7), p.73009
Ort / Verlag
Bristol: IOP Publishing
Erscheinungsjahr
2015
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
We experimentally investigate generation of backward 357 nm N2 laser in a gas mixture of N2 Ar using 800 nm femtosecond laser pulses, and examine the involved gain dynamics based on pump-probe measurements. Our findings show that a minimum duration of gain in the excited N2 molecules is required for generating intense backward nitrogen lasers, which is ∼0.8 ns under our experimental conditions. The results shed new light on the mechanism for generating intense backward lasers from nitrogen molecules, which are highly in demand for high sensitivity remote atmospheric sensing application.