title: Spatial mode cleaning by femtosecond filamentation in air.
abstract: By studying the conical emission of a blue femtosecond laser filament in air, it is shown that self-improvement of the beams' spatial mode quality occurs for a self-guided laser pulse.
authors.affiliation: Laboratoire d'Optique Appliquée, Ecole Nationale Supérieure de Techniques Avancées, Ecole Polytechnique, Palaiseau, France.
authors.forename: B
authors.initials: B
authors.lastname: Prade
authors.forename: M
authors.initials: M
authors.lastname: Franco
authors.forename: A
authors.initials: A
authors.lastname: Mysyrowicz
authors.forename: A
authors.initials: A
authors.lastname: Couairon
authors.forename: H
authors.initials: H
authors.lastname: Buersing
authors.forename: B
authors.initials: B
authors.lastname: Eberle
authors.forename: M
authors.initials: M
authors.lastname: Krenz
authors.forename: D
authors.initials: D
authors.lastname: Seiffer
authors.forename: O
authors.initials: O
authors.lastname: Vasseur