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Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses

Yi Liu 1 Yohann Brelet 1 Guillaume Point 1 Aurélien Houard 1 André Mysyrowicz 1 
1 ILM - Interaction Laser-Matière
LOA - Laboratoire d'optique appliquée
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.
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Submitted on : Wednesday, February 18, 2015 - 3:12:25 PM
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Yi Liu, Yohann Brelet, Guillaume Point, Aurélien Houard, André Mysyrowicz. Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses. Optics Express, 2013, 21, pp.22791. ⟨10.1364/OE.21.022791⟩. ⟨hal-01118072⟩



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