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Attosecond transient absorption around the ionization threshold of helium

F. Schapper, M. Holler, P. Rivière, L. Gallmann, U. Saalmann, J.-M. Rost, and U. Keller

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Abstract

We observe theoretically and experimentally the IR-assisted absorption of an attosecond pulse train in a helium gas target. The transmitted photon yield is modulated on an attosecond time-scale, and a spectrally localized emission occurs.

© 2010 Optical Society of America

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