title: Evolution and termination of a femtosecond laser filament in air.
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.
authors: Centre d'Optique, Photonique et Laser (COPL) and Département de physique, Université Laval, Québec, Québec G1K 7P4, Canada. yanping.chen1@ulaval.ca
authors: Yanping
authors: Y
authors: Chen
authors: Francis
authors: F
authors: Théberge
authors: Olga
authors: O
authors: Kosareva
authors: Nikolay
authors: N
authors: Panov
authors: Valerii P
authors: VP
authors: Kandidov
authors: See Leang
authors: SL
authors: Chin