Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.21: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Few-cycle 2 μm light source for high-order harmonic generation at 200 kHz repetition rate — •Arvid Klösgen, Katrin Meier, Niels Cordes, Julia Altenburg, Lina Hansen, and Jan Vogelsang — Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany

Electron microscopy with femtosecond time resolution requires laser sources with high repetition rates beyond 100 kHz to collect sufficient statistics without detrimental space charge effects. Investigations on the attosecond time scale additionally require high pulse energies to permit the generation of attosecond light pulses in a gas jet.

We report on a home-built high repetition rate laser system that includes an ytterbium-based 1030-nm, turn-key pump laser, white light generation, non-collinear optical parametric amplification in the visible range, difference frequency generation and additional optical parametric amplification. The system delivers broadband, few-cycle light pulses at a central wavelength of 2 μm with a pulse energy of 25 μJ and a passively stable carrier-envelope phase. Short- and long-term stability, beam quality, the temporal pulse structure and tunable parameters such as phase matching, time delay and pulse compression are subject of this study.

Keywords: Femtosecond Lasersystem; Optical parametric amplification; Difference frequency generation; Few-cycle pulses; High Harmonics Generation