title: Reconstruction of attosecond pulse trains using an adiabatic phase expansion.
abstract: We propose a new method to reconstruct the electric field of attosecond pulse trains. The phase of the high-order harmonic emission electric field is Taylor expanded around the maximum of the laser pulse envelope in the time domain and around the central harmonic in the frequency domain. Experimental measurements allow us to determine the coefficients of this expansion and to characterize the radiation with attosecond accuracy over a femtosecond time scale. The method gives access to pulse-to-pulse variations along the train, including the timing, the chirp, and the attosecond carrier envelope phase.
authors.affiliation: Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Varjú
authors.forename: Y
authors.initials: Y
authors.lastname: Mairesse
authors.forename: P
authors.initials: P
authors.lastname: Agostini
authors.forename: P
authors.initials: P
authors.lastname: Breger
authors.forename: B
authors.initials: B
authors.lastname: Carré
authors.forename: L J
authors.initials: LJ
authors.lastname: Frasinski
authors.forename: E
authors.initials: E
authors.lastname: Gustafsson
authors.forename: P
authors.initials: P
authors.lastname: Johnsson
authors.forename: J
authors.initials: J
authors.lastname: Mauritsson
authors.forename: H
authors.initials: H
authors.lastname: Merdji
authors.forename: P
authors.initials: P
authors.lastname: Monchicourt
authors.forename: A
authors.initials: A
authors.lastname: L'Huillier
authors.forename: P
authors.initials: P
authors.lastname: Salières