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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.9: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
100 kHz HHG at 18 eV for time-resolved ARPES — •Sunil Dahiya1, Hermann Erk1, Aaron Diercks1, Stephan Jauernik1, and Michael Bauer1,2 — 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany
Conventional time- and angle-resolved photoemission (trARPES) employs probe pulses of approximately 6 eV, providing only limited access to momentum space. To encompass a broader momentum space, covering the entire Brillouin zone in solids, higher photon energies are required. This objective is achieved through high harmonic generation (HHG) [1], generating photon pulses with energies in the range of 10 to several hundred electron volts.
In this presentation, we introduce a 100 kHz high-harmonic generation source for trARPES. The concept, including the laser system used, is based on a recently presented setup that produces vacuum ultraviolet (VUV) pulses at a photon energy of 11 eV [2]. In our experiment, we select the next higher harmonic (5th harmonic) of the spectrum at 18 eV photon energy. The HHG source is driven by the 3rd harmonic (350 nm, 0.02 mJ pulse energy) of a Yb:KGW amplifier (1038 nm, 190 fs) and is operated with Argon or Krypton. We demonstrate the performance of the source in initial ARPES measurements of various solid targets.
[1] T. Rohwer, et al., Nature 471, 490 (2011).
[2] C. Lee, et al, Rev. Sci. Instrum. 91, 043102 (2020).
Keywords: Tr-ARPES; High harmonic generation; Electronic band structure; Enlarging momentum space; solid surface targets