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A: Fachverband Atomphysik
A 19: Interaction with strong or short laser pulses II
A 19.2: Vortrag
Mittwoch, 11. März 2020, 14:30–14:45, f107
Dynamic quantum state holography — •Kevin Eickhoff1, Stefanie Kerbstadt1,2, Tim Bayer1, and Matthias Wollenhaupt1 — 1Carl von Ossietzky Universität Oldenburg, Institut für Physik, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg — 2Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Hamburg
We present a pulse-shaper-based holographic technique for the time-resolved and phase-sensitive observation of ultrafast quantum dynamics. The technique combines bichromatic white light polarization pulse shaping with the tomographic reconstruction of photoelectron wave packets. The physical scheme is based on the interference of a probe wave packet from (3+1) resonance-enhanced multiphoton ionization (REMPI) via the target states and a reference wave packet from (2+1) REMPI of the ground state. To create the wave packets, we employ carrier envelope phase (CEP) stable bichromatic (2ω : 3ω) pump-probe pulse sequences. The scheme is demonstrated on femtosecond Rydberg wave packet dynamics in potassium atoms using corotating circularly polarized pulse sequences. The interference of continuum states with different angular momenta yields a crescent-shaped photoelectron wave packet rotating in the laser polarization plane due to the interplay of the optical phase and the accumulated quantum phase (Kerbstadt et al. Nat. Comm. 10, 658 (2019)). Access to the photoelectron asymmetry is provided by CEP control of the wave packet’s rotation, enabling background-free and time-resolved detection of the crescent’s angular motion mapping the bound electron dynamics.