Berlin 2005 – wissenschaftliches Programm

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A: Atomphysik

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

A 7.1: Hauptvortrag

Samstag, 5. März 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. Schafer² — ¹Physik 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.