title: Controlling the spacing of attosecond pulse trains from relativistic surface plasmas.
abstract: When a laser pulse hits a solid surface with relativistic intensities, XUV attosecond pulses are generated in the reflected light. We present an experimental and theoretical study of the temporal properties of attosecond pulse trains in this regime. The recorded harmonic spectra show distinct fine structures which can be explained by a varying temporal pulse spacing that can be controlled by the laser contrast. The pulse spacing is directly related to the cycle-averaged motion of the reflecting surface. Thus the harmonic spectrum contains information on the relativistic plasma dynamics.
authors.affiliation: Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Behmke
authors.forename: D
authors.initials: D
authors.lastname: an der Brügge
authors.forename: C
authors.initials: C
authors.lastname: Rödel
authors.forename: M
authors.initials: M
authors.lastname: Cerchez
authors.forename: D
authors.initials: D
authors.lastname: Hemmers
authors.forename: M
authors.initials: M
authors.lastname: Heyer
authors.forename: O
authors.initials: O
authors.lastname: Jäckel
authors.forename: M
authors.initials: M
authors.lastname: Kübel
authors.forename: G G
authors.initials: GG
authors.lastname: Paulus
authors.forename: G
authors.initials: G
authors.lastname: Pretzler
authors.forename: A
authors.initials: A
authors.lastname: Pukhov
authors.forename: M
authors.initials: M
authors.lastname: Toncian
authors.forename: T
authors.initials: T
authors.lastname: Toncian
authors.forename: O
authors.initials: O
authors.lastname: Willi