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Berlin 2005 – scientific programme

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A: Atomphysik

A 7: Atoms and Ions in Ultra Short and Strong laser Fields I

A 7.1: Invited Talk

Saturday, March 5, 2005, 08:30–09:00, HU 3094

Quantum Path Control Using Attosecond Pulse Trains — •Jens Biegert1, Arne Heinrich1, Christoph P. Hauri1, Wouter Kornelis1, Philip Schlup1, Marcel Anscombe1, Ursula Keller1, Mette Gaarde2, and Kenneth J. Schafer21Physik Department, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland — 2Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A.

We show that attosecond pulse trains are a natural tool for controlling strong field processes such as high order harmonic generation and rescattering. When used in combination with an intense infrared laser field, the timing of the pulse train with respect to the IR laser field can be used to microscopically select a single quantum path contribution to a process that would otherwise consist of several interfering components. We demonstrate this strong field control mechanism by manipulating the time-frequency properties of high order harmonics at the single atom level. We then show that the qualitative features remain when investigating the same effect in the strong field approximation including macroscopic propagation. Furthermore we show first experimental results on enhancement of the photon spectrum of high order harmonics.

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