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MO: Fachverband Molekülphysik
MO 21: Poster – Interaction with Strong or Short Laser Pulses (joint session A/MO)
MO 21.10: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Probing electron dynamics in gases and pulse characterization using an interferometric Velocity Map Imaging setup — •Pranav Sreekumar1, David Schmitt1, Sven Fröhlich1, Uwe Morgner1, Milutin Kovacev1, and Andrea Trabattoni1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 2Center for Free-Electron Laser Science CFEL, DESY Hamburg
The strong-field ionization of rare gases using intense fs laser pulses results in characteristic spectra for photoelectrons in the momentum and energy space. It has been shown that such signatures contain holographic information which can be obtained experimentally with high spatial resolution using a Velocity Map Imaging (VMI) spectrometer for photoelectrons. However, the interpretation of these velocity maps is not straightforward as they often contain signatures arising from multiple phenomena and the isolation of individual signatures is a significant challenge.
In this poster, we will present our setup of an interferometric beamline coupled into a VMI. With our setup, we aim to extract the sub-optical cycle photoelectron holographic signatures, which promises to offer information on electron dynamics within atoms occurring at sub-to-few fs timescales. Besides this, we also demonstrate the capability to perform in-situ pulse characterization, utilizing the higher-order nonlinearity associated with strong-field ionization [1].
[1] Geffert et al., Optics Letters 47.16, 3992-3995 (2022)
Keywords: velocity map imaging; strong field physics; above threshold ionization; photoelectron holography; pulse characterization