title: X-ray radiation from nonlinear Thomson scattering of an intense femtosecond laser on relativistic electrons in a helium plasma.
abstract: We have generated x-ray radiation from the nonlinear Thomson scattering of a 30 fs/1.5 J laser beam on plasma electrons. A collimated x-ray radiation with a broad continuous spectrum peaked at 0.15 keV with a significant tail up to 2 keV has been observed. These characteristics are found to depend strongly on the laser strength parameter a(0). This radiative process is dominant for a(0) greater than unity at which point the relativistic scattering of the laser light originates from MeV energy electrons inside the plasma.
authors: Laboratoire d'Optique Appliquée, ENSTA, CNRS UMR7639, Ecole Polytechnique, Chemin de la Hunière, 91761 Palaiseau, France.
authors: K
authors: K
authors: Ta Phuoc
authors: A
authors: A
authors: Rousse
authors: M
authors: M
authors: Pittman
authors: J P
authors: JP
authors: Rousseau
authors: V
authors: V
authors: Malka
authors: S
authors: S
authors: Fritzler
authors: D
authors: D
authors: Umstadter
authors: D
authors: D
authors: Hulin