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O: Fachverband Oberflächenphysik

O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces

O 79.6: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

High-repetition rate extreme ultraviolet HHG light source for femtosecond surface science experiments — •Christina Nolte¹, Amelie Schulte¹, Marco Merboldt¹, Germaine Arend¹, Steffen Hädrich², Tino Eidam², Jens Limpert², Sabine Steil¹, Daniel Steil¹, and Stefan Mathias¹ — ¹1st Physical Institute, University of Göttingen — ²Active Fiber Systems GmbH, Jena

Table-top coherent ultrashort extreme ultraviolet light sources from high-harmonic generation have been shown to enable a wealth of novel experiments in the field of ultrafast surface science [1,2]. However, the full potential of this approach has not yet been achieved because, to date, high harmonics generated by low-repetition rate Ti:sapphire lasers required a trade-off between photon flux, repetition rate, energy and time resolution [3]. Here, we present a HHG light source driven by a nonlinearly compressed 0.5 MHz fiber laser enabling >10¹⁰ photons/s in single harmonics between 22-73 eV. In addition, our setup enables the direct generation of harmonics with bandwidths of the order of about 50 meV, so that the light source is ideally suited for next generation femtosecond spin- and angle-resolved photoemission experiments.

[1] Rohwer et al., Nature 471, 490 (2011)

[2] Mathias et al., JESRP 189, 164 (2013)

[3] Eich et al., JESRP 195, 231 (2014)