Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Attosecond Physics I (joint session A/MO)
A 6.1: Hauptvortrag
Dienstag, 11. März 2025, 11:00–11:30, GrHS Mathe
Water Window HHG continua driven by sub-cycle, nonsinusoidal IR Pulses — •Fabian Scheiba1,2,3, Miguel Silva1,2, Giulio Maria Rossi1,3, Roland E. Mainz1,2,3, Maximilian Kubullek1,2, Rafael d. Q. Garcia1,2, and Franz X. Kärtner1,2,3 — 1Center for Free-Electron Laser Science CFEL and Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — 2Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
We present the next milestone of our infrared (IR) Parametric Waveform Synthesizer (PWS), that is the generation of HHG continua in the Water Window (WW) spectral region, up to 450 eV. The IR driver pulses are characterized to a pulse duration of 2.8 fs at 1.6 µm central wavelength and an update of the attosecond beamline apparatus enables for high pressure phase matching in Helium and Neon gases. The PWS allows for sub-cycle control of the HHG process and following control of the HHG spectra. Scans of the given phase parameters of the driving electric field show a strong dependence of the generated HHG and therefore unmatched tuning capabilities. Furthermore, calibrated measurements of the HHG yield allows us to claim a significant efficiency increase comapared to a few cycle sinusoidal driver pulse.
Keywords: sub-cycle; water window; HHG; continua; pump-probe