Hannover 2020 – wissenschaftliches Programm

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AKjDPG: Arbeitskreis junge DPG

AKjDPG 1: Tutorial Chirality (joint session AKjDPG/Q)

AKjDPG 1.1: Tutorium

Sonntag, 8. März 2020, 16:00–17:00, b305

Photoionization with polarization-shaped ultrashort laser pulses — •Matthias Wollenhaupt — Carl von Ossietzky Universität Oldenburg, Institut für Physik, 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 on 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 [1]. 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 [2] and highlight experiments with bichromatic carrier-envelop phase-stable polarization-tailored laser pulses to generate c7 rotationally symmetric and asymmetric momentum distributions [3].

[1]M. Wollenhaupt et al., Phys. Rev. Lett. 89, 173001 (2002)

[2]D. Pengel et al., Phys. Rev. Lett. 118, 053003 (2017)

[3]S. Kerbstadt et al., Nat. Comm. 10, 658 (2019)