Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 2: Attosecond Physics I (joint session A/MO)
MO 2.1: Vortrag
Montag, 11. März 2024, 11:00–11:15, HS 1098
Ultrafast photoelectron spectroscopy with odd and even high-order harmonics — •Marvin Schmoll1, Barbara Merzuk1, Samuel Discher1, Dominik Ertel1, Ioannis Makos1, Claus D. Schröter2, Thomas Pfeifer2, Robert Moshammer2, Luca Poletto3, Fabio Frassetto3, and Giuseppe Sansone1 — 1Universität Freiburg, Physikalisches Institut, Freiburg, Germany — 2Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany — 3CNR-Institute of Photonics and Nanotechnologies, Padova, Italy
High-order harmonic generation (HHG) in noble gases produces odd harmonics of the driving field. Adding a weaker second harmonic one can break the underlying symmetry and achieve both odd and even high-order harmonics.
We present an implementation of a collinear setup for such two-color HHG similar to what was first presented in ref. [1], which allows to adjust the relative phase between the fundamental and second harmonic component. Being implemented in combination with a collinear beamline for XUV-IR interferometry [2] we can perform high stability ultrafast photoelectron spectroscopy using these high order harmonics.
Our first results using Argon as a target gas show the viability of the method by demonstrating delay-dependent oscillations in the photoelectron yield for specific energies. These exhibit a period equal to that of the fundamental driving field as opposed to twice that period, which is known from experiments with odd orders only.
[1] N. Dudovich et al., Nature Phys. 2, 781 (2006)
[2] D. Ertel et al., Rev. Sci. Instrum. 94, 073001 (2023)
Keywords: two-color high-order harmonic generation (HHG); attosecond physics; photoelectron spectroscopy; XUV-IR interferometry