Attosecond Electron Spectroscopy Using a Novel Interferometric Pump-Probe Technique

Johan Mauritsson, Thomas Remetter, Marko Swoboda, Kathrin Klünder, Anne L'Huillier, K. J. Schafer, O. Ghafur, F. Kelkensberg, W. Siu, Per Johnsson, M. J. J. Vrakking, I. Znakovskaya, T. Uphues, S. Zherebtsov, M. F. Kling, F. Lepine, E. Benedetti, F. Ferrari, G. Sansone, M. Nisoli

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Abstract

We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets (WPs) that uses a free WP as a reference to measure a bound WP. We demonstrate our method by exciting helium atoms using an attosecond pulse (AP) with a bandwidth centered near the ionization threshold, thus creating both a bound and a free WP simultaneously. After a variable delay, the bound WP is ionized by a few-cycle infrared laser precisely synchronized to the original AP. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multipath interference. Analysis of the interferogram allows us to determine the bound WP components with a spectral resolution much better than the inverse of the AP duration.
Original languageEnglish
Article number053001
JournalPhysical Review Letters
Volume105
Issue number5
DOIs
Publication statusPublished - 2010

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

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