title: Backscattered supercontinuum emission from high-intensity laser-plasma interactions.
abstract: We performed high-intensity subpicosecond laser-plasma interaction experiments to examine nonlinear scattering mechanisms in underdense plasmas. At incident laser intensities of 2 x 10(18) W/cm(2) the stimulated-Raman-backscattered spectrum exhibited an extremely broad, supercontinuumlike structure (Deltaomega/omega(0) > 1) extending from ~500 to >1200 nm (limited only by detector sensitivity). Large-amplitude modulations in the spectrum of the backscattered light were measured and are attributed to an interaction of the stimulated-Raman-scattered radiation with ion plasma waves.
authors.forename: A
authors.initials: A
authors.lastname: Ting
authors.forename: K
authors.initials: K
authors.lastname: Krushelnick
authors.forename: H R
authors.initials: HR
authors.lastname: Burris
authors.forename: A
authors.initials: A
authors.lastname: Fisher
authors.forename: C
authors.initials: C
authors.lastname: Manka
authors.forename: C I
authors.initials: CI
authors.lastname: Moore