title: Underwater acoustic wave generation by filamentation of terawatt ultrashort laser pulses.
abstract: Acoustic signals generated by filamentation of ultrashort terawatt laser pulses in water are characterized experimentally. Measurements reveal a strong influence of input pulse duration on the shape and intensity of the acoustic wave. Numerical simulations of the laser pulse nonlinear propagation and the subsequent water hydrodynamics and acoustic wave generation show that the strong acoustic emission is related to the mechanism of superfilamention in water. The elongated shape of the plasma volume where energy is deposited drives the far-field profile of the acoustic signal, which takes the form of a radially directed pressure wave with a single oscillation and a very broad spectrum.
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Vytautas
authors.initials: V
authors.lastname: Jukna
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Amélie
authors.initials: A
authors.lastname: Jarnac
authors.affiliation: Centre de Physique Théorique, École polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau, France.
authors.forename: Carles
authors.initials: C
authors.lastname: Milián
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Yohann
authors.initials: Y
authors.lastname: Brelet
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Carbonnel
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Yves-Bernard
authors.initials: YB
authors.lastname: André
authors.affiliation: Laboratoire de Mécanique et d'Acoustique, CNRS-UPR 7051, 4 impasse Nikola Tesla, CS 40006, 13453 Marseille Cedex 13.
authors.forename: Régine
authors.initials: R
authors.lastname: Guillermin
authors.affiliation: Laboratoire de Mécanique et d'Acoustique, CNRS-UPR 7051, 4 impasse Nikola Tesla, CS 40006, 13453 Marseille Cedex 13.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Sessarego
authors.affiliation: DGA Techniques Navales, Toulon, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Fattaccioli
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: André
authors.initials: A
authors.lastname: Mysyrowicz
authors.affiliation: Centre de Physique Théorique, École polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Couairon
authors.affiliation: LOA, ENSTA ParisTech, CNRS, École Polytechnique, Université Paris Saclay, F-91762 Palaiseau cedex, France.
authors.forename: Aurélien
authors.initials: A
authors.lastname: Houard