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Time-resolved study of laser emission in nitrogen gas pumped by two near IR femtosecond laser pulses

Abstract : The time profile of the lasing signal at 391.4 nm emitted by a weakly ionized gas of nitrogen molecules at low pressure is measured under double excitation with intense femtosecond laser pulses at 800 nm. An abrupt decrease of the emission occurs at the time of arrival of the second pulse. It is explained by a transfer of population from ground to first excited ionic level and by a disruption of coherence, terminating the conditions for lasing in a V-scheme without population inversion.
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https://hal-ensta-paris.archives-ouvertes.fr//hal-03158949
Contributor : Aurélien Houard <>
Submitted on : Friday, March 12, 2021 - 4:16:18 PM
Last modification on : Tuesday, March 16, 2021 - 3:31:57 AM
Long-term archiving on: : Sunday, June 13, 2021 - 6:03:19 PM

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Rostyslav Danylo, Guillaume Lambert, Y Liu, Vladimir Tikhonchuk, Aurélien Houard, et al.. Time-resolved study of laser emission in nitrogen gas pumped by two near IR femtosecond laser pulses. Optics Letters, Optical Society of America - OSA Publishing, 2021, 46 (6), pp.1253-1253. ⟨10.1364/OL.414863⟩. ⟨hal-03158949⟩

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