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

Rostyslav Danylo 1, 2 Guillaume Lambert 3 Y Liu 2, 4 Vladimir Tikhonchuk 5, 6 Aurélien Houard 1 André Mysyrowicz 1
1 ILM - Interaction Laser-Matière
LOA - Laboratoire d'optique appliquée
2 Shanghai Key Lab of Modern Optical System
3 LOA - Laboratoire d'optique appliquée
4 CAS Center for Excellence in Ultra-Intense Laser Science
5 CELIA - Centre d'Etudes Lasers Intenses et Applications
6 Institute of Physics, ELI Beamlines, Academy of Sciences of the Czech Republic
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.
Keywords : Ultrafast Optics nonlinear optics Lasing effect laser Filamentation femtoseconde Filamentation laser
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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

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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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