Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

Q 27.12: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Characterization of a coincidence detection unit for ultracold quantum gases combining electron velocity-map-imaging and ion microscopy — Julian Fiedler, Jette Heyer, Mario Großmann, •Lasse Paulsen, Marlon Hoffmann, Klaus Sengstock, Markus Drescher, Philipp Wessels-Staarmann, and Juliette Simonet — Center for Optical Quantum Technologies, Universität Hamburg, Hamburg, Germany

Femtosecond laser pulses enable instantaneous ionization or excitation of ultracold quantum gases, facilitating studies of strongly interacting many-body systems like ultracold microplasma and dense Rydberg gases. To gain a detailed understanding of the dynamics of these systems, a high temporal, spatial, energetic and angular resolution of the ionization products is required.

We report on the construction of a novel detection unit consisting of an electron velocity-map-imaging spectrometer and an ion microscope. This setup enables simultaneous measurements of ion spatial distributions at a simulated resolution of 100 nm and electron momentum distributions with a simulated energy resolution < 10 % over six orders of magnitude. We characterize the coincidence unit via photoionization studies of a pulsed krypton gas jet using femtosecond laser pulses. The integration of this new coincidence detection unit in an ultracold quantum gas experiment will grant access to correlations as well as the time-resolved dynamics.

This work is funded by the Cluster of Excellence "CUI: Advanced Imaging of Matter" of the DFG - EXC 2056 - project ID 390715994.

Keywords: Ultracold atoms; Ultrafast laser pulses; Ion microscopy; Velocity-map imaging spectrometer; Ultracold ions