Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 17: Attosecond Physics (jointly with Q)
A 17.2: Vortrag
Mittwoch, 21. März 2007, 14:30–14:45, 6G
Attosecond Pulse Trains with Two Colors — •Marko Swoboda1, Johan Mauritsson1, Erik Gustafsson1, Per Johnsson1, Thomas Remetter1, Thierry Ruchon1, Anne L'Huillier1, and Kenneth Schafer2 — 1Department of Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden — 2Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
We demonstrate how a sequence of identical attosecond pulses created with a two-color laser field can be used to release electron wave packets exactly once per laser cycle. The released electrons can then be used to steer and measure atomic processes on attosecond time scales. The pulses arriving at the frequency of the probing infrared field allow us to compare this to a stroboscope, each pulse identical to previous pulses and repeatedly performing measurements in the exact same conditions. Using this technique, we study the ionization of He in presence of a strong infrared laser field which shifts the electron momentum distribution depending on the vector potential of the light field. In this experiment, Coulomb-refocusing and other atomic effects can be observed from driving the electron wave packets back to the atomic core.