Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 34: Atoms in Strong Fields I

A 34.2: Talk

Friday, March 10, 2017, 11:30–11:45, N 2

Single-beam bichromatic control of resonance-enhanced multi-photon ionization — •Tim Bayer, Stefanie Kerbstadt, Daniela Johannmeyer, and Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Institut für Physik, Carl-von-Ossietzky-Straße 9-11, 26129 Oldenburg

Coherent control of quantum phenomena is based on the interference of multiple quantum pathways connecting the initial system state with a preselected target channel. Recently, ultrashort bichromatic laser fields have emerged as an efficient tool to steer coherent electron dynamics in, e.g., strong-field ionization of atoms and high harmonic generation. The beauty of bichromatic fields lies in the capability to disentangle different quantum pathways via frequency mixing and selection rules. Here we employ polarization-tailored bichromatic fields from a 4f polarization pulse shaper [1] to study resonance-enhanced multi-photon ionization of atoms as a prototype scenario for multi-pathway coherent control. Three-dimensional detection of the photoelectron momentum distribution by photoelectron imaging tomography provides detailed insights into the excitation and ionization dynamics. We present first results of current experiments on potassium atoms using orthogonal linearly and counter-rotating circularly polarized bichromatic fields.

[1] S. Kerbstadt, L. Englert, T. Bayer, M. Wollenhaupt, J. Mod. Opt., accepted (2016)