Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.15: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG1

Bichromatic control of multi-photon ionization — •Daniela Johannmeyer, Stefanie Kerbstadt, Dominik Pengel, Lars Englert, Tim Bayer, and Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Institut für Physik, Carl-von-Ossietzky-Straße 9-11, 26129 Oldenburg

Polarization-shaped bichromatic laser fields have attracted much interest for the control of coherent electron dynamics. In view of quantum control, the benefit of bichromatic fields lies in the ability to disentangle different quantum pathways. Recently, we introduced a novel technique for the shaper-based generation of ultrashort bichromatic fields with freely adjustable spectral amplitude profile, phase and polarization state of each color [1]. Here we combine bichromatic polarization shaping with angular resolved photoelectron spectroscopy using velocity map imaging. The 3D photoelectron angular and energy distribution (PAD) is retrieved by tomographic methods. We study resonance enhanced multi-photon ionization of atoms as a prototype scenario for multi-path coherent control. In a bichromatic pump-probe scheme, we study the time evolution of a resonantly excited spin wave packet in the PAD.

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