title: Observation of a train of attosecond pulses from high harmonic generation.
abstract: In principle, the temporal beating of superposed high harmonics obtained by focusing a femtosecond laser pulse in a gas jet can produce a train of very short intensity spikes, depending on the relative phases of the harmonics. We present a method to measure such phases through two-photon, two-color photoionization. We found that the harmonics are locked in phase and form a train of 250-attosecond pulses in the time domain. Harmonic generation may be a promising source for attosecond time-resolved measurements.
authors.affiliation: Commissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.
authors.forename: P M
authors.initials: PM
authors.lastname: Paul
authors.forename: E S
authors.initials: ES
authors.lastname: Toma
authors.forename: P
authors.initials: P
authors.lastname: Breger
authors.forename: G
authors.initials: G
authors.lastname: Mullot
authors.forename: F
authors.initials: F
authors.lastname: Auge
authors.forename: P
authors.initials: P
authors.lastname: Balcou
authors.forename: H G
authors.initials: HG
authors.lastname: Muller
authors.forename: P
authors.initials: P
authors.lastname: Agostini