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A: Fachverband Atomphysik
A 18: Interaction with Strong or Short Laser Pulses I (joint session A/MO)
A 18.3: Talk
Wednesday, March 4, 2026, 15:15–15:30, N 2
Towards a velocity-map-imaging spectrometer for ultracold atoms — •Lasse Paulsen1, Julian Fiedler1, Jette Heyer1, Markus Drescher1, Klaus Sengstock1, Klaus Bartschat2, Juliette Simonet1, and Philipp Wessels-Staarmann1 — 1Center for Optical Quantum Technologies, Universität Hamburg, Hamburg, Germany — 2Department of Physics and Astronomy, Drake University, Des Moines, USA
The intense electric field of femtosecond laser pulses enables the ultrafast creation of ions and electrons within an ultracold quantum gas. This opens new possibilities for investigating the dynamics of ionic impurities and atom-ion hybrid systems, provided that the kinematics of the ionization process are well understood.
Here we report on the characterization of an electron velocity-map-imaging spectrometer for ultracold quantum gases, as part of a novel coincidence detection unit including an ion microscope. For characterization a pulsed krypton gas jet is ionized by femtosecond laser pulses with a center wavelength of 511 nm and peak intensities around 6 × 1013 W/cm2. The measured photoelectron momentum distribution is compared to theoretical predictions based on the solution of the time-dependent Schrödinger equation, which confirm the observed significant shifts in the photoelectron energies caused by the high peak intensities.
This work is funded by the Cluster of Excellence "CUI: Advanced Imaging of Matter" of the DFG - EXC 2056 - project ID 390715994 and by the NSF under project Nos. PHY-2110023 and PHY-2408484.
Keywords: Velocity-map-imaging; Ultrashort laser pulses; Multiphoton ionization; Quantum gases; Atom-Ion hybrid systems