SAMOP 2021 – wissenschaftliches Programm
AKjDPG 1.2: Tutorium
Montag, 20. September 2021, 09:45–10:30, H1
Photoionization with polarization-shaped ultrashort laser pulses — •Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg
Nowadays, multiphoton ionization (MPI) using advanced light sources and sophisticated detection techniques is investigated to observe and control ultrafast quantum dynamics. In this tutorial, we present an introduction to the coherent control of photoionization with ultrashort laser pulses and give an overview of experimental techniques for femtosecond laser pulse shaping and tomographic reconstruction of 3D photoelectron momentum distributions. Based on relevant experiments, we will discuss the underlying physical mechanisms of controlled MPI. In the first experiment, phase-locked double pulse sequence laser pulses are used to control interferences in the momentum distribution of free electron wave packets . We introduce non-perturbative control by manipulation of dressed state population dynamics through the optical phases. The main part of the tutorial deals with 3D control of the momentum distribution of free electron wave packets. We discuss the creation of vortex-shaped photoelectron momentum distributions with counterrotating circularly polarized femtosecond laser pulses  and highlight experiments with bichromatic carrier-envelop phase-stable polarization-tailored laser pulses to generate c7 rotationally symmetric and asymmetric momentum distributions .
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