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Abstract
We report on the lasing in air and pure nitrogen gas pumped by a single 800 nm femtosecond laser pulse. Depending on gas pressure, incident laser power and beam convergence, different lasing lines are observed in the forward direction with rapid change of their relative intensities. The lines are attributed to transitions between vibrational and rotational levels of the first negative band of the singly charged nitrogen molecule-ion. We show that self-seeding plays an important role in the observed intensity changes.
Highlights
Lasing in ambient air or its major components (N2 and O2) when pumped by an intense ultrashort laser pulse has attracted much attention in recent years [1,2,3,4,5,6,7,8,9,10,11]
We report on the lasing in air and pure nitrogen gas pumped by a single 800 nm femtosecond laser pulse
Incident laser power and beam convergence, different lasing lines are observed in the forward direction with rapid change of their relative intensities
Summary
Lasing in ambient air or its major components (N2 and O2) when pumped by an intense ultrashort laser pulse has attracted much attention in recent years [1,2,3,4,5,6,7,8,9,10,11].
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