Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Poster: Interaction with strong or short laser pulses

A 10.14: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Strong Field Ionization of atoms with elliptically polarized light — •Nicolas Camus1, Lutz Fechner1, Andreas Krupp1, Lukas Heizmann1, Joachim Ullrich2, Thomas Pfeifer1, and Robert Moshammer11Max-Planck-Institut für Kernphysik, Heidelberg — 2Physikalisch-Technische Bundesanstalt, Braunschweig

We present kinematically complete strong field ionization of atoms by elliptically polarized light.

We experimentally produce arbitrary elliptically polarized light using a Mach-Zehnder interferometer. This optical setup allows shaping the polarization state of femtosecond pulses for a broad range of wavelengths. Using a Reaction Microscope, we are able to measure the three-dimensional momentum vector of all ionization fragments in coincidence.

Analyzing their momentum distribution allows to test current theories about tunneling of electron in elliptical/circular strong laser fields. More important, the dependence of these theories on the Keldysh parameter (describing which ionization picture is more relevant: tunneling or multi-photon) is investigated through the variation of target, intensity and wavelength of the laser used in the experiment.

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DPG-Physik > DPG-Verhandlungen > 2015 > Heidelberg