Observation of a Train of Attosecond Pulses from High Harmonic Generation
P. PaulCommissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, FranceE. S. TomaFOM–Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, NetherlandsP. BregerCommissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, FranceG. MullotLaboratoire d'Optique Appliquée,École Nationale Supérieure de Techniques Avancées (ENSTA)–Ecole Polytechnique, CNRS UMR 7639, 91761 Palaiseau Cedex, FranceF. AugéLaboratoire d'Optique AppliquéePh. BalcouÉcole PolytechniqueH. G. MullerFOM–Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, NetherlandsPierre AgostiniCommissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France
2001en
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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.
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