Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Atomic systems in external fields

A 4.1: Hauptvortrag

Montag, 11. März 2019, 10:30–11:00, S HS 3 Physik

Odd electron wave packets from cycloidal ultrashort laser fields — •Stefanie Kerbstadt, Kevin Eickhoff, Tim Bayer, and Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Oldenburg

By combining bichromatic white light supercontinuum polarization pulse shaping with high resolution photoelectron tomography, we devise a general optical scheme [1] for three-dimensional quantum control. The scheme is exemplified on an atomic model system to create and manipulate carrier-envelope phase (CEP)-sensitive electron wave packets with arbitrary rotational symmetry. In the experiments, we use CEP-stable bichromatic counter- and corotating femtosecond laser pulses with continuously tunable center frequencies to generate 7-fold rotational symmetric and completely asymmetric photoelectron momentum distributions from multiphoton ionization of sodium atoms. To elucidate the physical mechanisms, we investigate the interplay between the symmetry properties of the driving field and the resulting electron wave packets by varying the optical field parameters. In addition, the generated photoelectron wave packets are shown to be a suitable tool for holographic and spectroscopic measurements of relative quantum phases, as demonstrated on excited Rydberg states.

[1] S. Kerbstadt et al., Ultrashort polarizationtailored Bichromatic, Opt. Express 25(11), 12518-12530 (2017).