Speaker
Description
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 $0.5\,\text{MHz}$ fiber laser providing $10^{10}$ photons/s in single harmonics between $22-73\,\text{eV}$. Two parallel beamlines allow for high harmonic generation in a tight focusing gas jet configuration with different fundamental drivers ($1030\,\text{nm}$ and $515\,\text{nm}$). In addition, our setup enables the direct generation of harmonics with bandwidths of the order of about $50\,\text{meV}$ due to window-type Fano resonances in Argon. This makes the light source ideally suited for next generation femtosecond angle-resolved photoemission experiments.
[1] T. Rohwer et al., Nature 471, 490 (2011).
[2] S. Mathias et al., J. Electron. Spectrosc. Relat. Phenom. 189, 164 (2013).
[3] S. Eich et al., J. Electron. Spectrosc. Relat. Phenom. 195, 231 (2014).
