title: Strong enhancement of terahertz radiation from laser filaments in air by a static electric field.
abstract: We observe a 3 order of magnitude enhancement of the terahertz energy radiated by a femtosecond pulse undergoing filamentation in air in the presence of a static electric field. Measurements of terahertz pulse duration, spectrum, polarization, and radiation pattern elucidate the physical processes responsible for this radiation. A theoretical model explains the results and predicts another 3 orders of magnitude enhancement with a terawatt laser pulse.
authors.affiliation: Laboratoire d'Optique Appliquée, ENSTA, Ecole Polytechnique, CNRS UMR 7639, Palaiseau, 91761 France.
authors.forename: Aurélien
authors.initials: A
authors.lastname: Houard
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Bernard
authors.initials: B
authors.lastname: Prade
authors.forename: Vladimir T
authors.initials: VT
authors.lastname: Tikhonchuk
authors.forename: André
authors.initials: A
authors.lastname: Mysyrowicz