Evolution and termination of a femtosecond laser filament in air |
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Authors: | Chen Yanping Théberge Francis Kosareva Olga Panov Nikolay Kandidov Valerii P Chin See Leang |
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Affiliation: | Centre d'Optique, Photonique et Laser (COPL) and Département de physique, Université Laval, Québec, Québec G1K 7P4, Canada. yanping.chen1@ulaval.ca |
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Abstract: | The evolution of the filamentation of a femtosecond laser pulse in air is measured. The divergence of the filament core is almost constant over a long distance, encompassing a zone with efficient ionization followed by another where ionization is much weaker. At the end, the core diverges out linearly with a low divergence due to self-spatial filtering. |
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