SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Atomic systems in external fields

A 6.1: Poster

Dienstag, 21. September 2021, 16:30–18:30, P

Trichromatic shaper-based quantum state holography — •Kevin Eickhoff, Lea-Christin Feld, Darius Köhnke, Tim Bayer, and Matthias Wollenhaupt — Carl von Ossietzky Universität, Oldenburg, Deutschland

We present a shaper-based quantum state holography (SQuaSH) scheme based on the holographic generation of photoelectron superposition wave packets by multiphoton ionization (MPI) using pulse-shaper-generated trichromatic pump-probe-reference femtosecond pulse sequences. Differential detection of the created photoelectron wave packets enables the measurement of quantum phases imprinted in the hologram by the ionization dynamics. We implement the scheme experimentally by combining trichromatic white light shaping with velocity map imaging (VMI) of photoelectron wave packets, and investigate the MPI of potassium atoms. By interference of a probe wave packet, created by (2+1) resonance-enhanced MPI (REMPI) via the 3d-state being two-photon resonant with the pump-pulse, and a reference wave packet from non-resonant three-photon ionization of the 4s ground state, we create f-type photoelectron holograms. Coherent control of the holograms by the relative optical phases of the pulse sequence is demonstrated and utilized to separate the phase-sensitive part of the hologram from the phase-insensitive background. Then we apply the scheme to determine time- and energy-dependent atomic ionization phases arising due to the time-evolution of the excited system and the detuning of the pump-pulse from the 3d-state.