title: Ionization-induced conversion of ultrashort Bessel beam to terahertz pulse.
abstract: We examine the conical terahertz emission from the superluminous ionization front created in air by an axicon-focused femtosecond laser pulse. We develop the theoretical model that explains the experimental results and predicts new possibilities to control terahertz pulse parameters.
authors.affiliation: Institute of Applied Physics, Russian Academy of Sciences, 46 Ulyanov Street, Nizhny Novgorod 603950, Russia.
authors.forename: V A
authors.initials: VA
authors.lastname: Kostin
authors.forename: N V
authors.initials: NV
authors.lastname: Vvedenskii