title: Experimental investigation of stimulated Raman and Brillouin scattering instabilities driven by two successive collinear picosecond laser pulses.
abstract: Backward stimulated Raman and Brillouin scattering (SRS and SBS) are experimentally investigated by using two successive 1-μm, 1.5-ps FWHM laser pulses. The collinear pulses, separated by 3 or 6 ps and of moderate laser intensities (∼2×10^{16}Wcm^{-2}), are fired into a preionized He plasma of density ∼2.5-6×10^{19}cm^{-3}. The electron plasma waves and ion acoustic waves, respectively driven by SRS and SBS, are analyzed through space- and time-resolved Thomson scattering. Depending on the laser and plasma parameters, we observe the effect of the first pulse on the time-resolved SRS and SBS signals of the second pulse. The measurements are found to qualitatively agree with the results of a large-scale particle-in-cell simulation.
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: C
authors.initials: C
authors.lastname: Rousseaux
authors.affiliation: LULI - CNRS, Ecole Polytechnique, CEA, Université Paris-Saclay, UPMC Université Paris 06, Sorbonne Universités, F-91128 Palaiseau Cedex, France.
authors.forename: S D
authors.initials: SD
authors.lastname: Baton
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: D
authors.initials: D
authors.lastname: Bénisti
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: L
authors.initials: L
authors.lastname: Gremillet
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: B
authors.initials: B
authors.lastname: Loupias
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: F
authors.initials: F
authors.lastname: Philippe
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: V
authors.initials: V
authors.lastname: Tassin
authors.affiliation: LULI - CNRS, Ecole Polytechnique, CEA, Université Paris-Saclay, UPMC Université Paris 06, Sorbonne Universités, F-91128 Palaiseau Cedex, France.
authors.forename: F
authors.initials: F
authors.lastname: Amiranoff
authors.affiliation: P-24, Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Kline
authors.affiliation: P-24, Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Montgomery
authors.affiliation: Polymath Research Inc., 827 Bonde Court, Pleasanton, California 94566, USA.
authors.forename: B B
authors.initials: BB
authors.lastname: Afeyan