… In this contribution a fully tunable, table-top high harmonic source with a photon flux of over
per harmonic line in the range of 50 eV to 70 eV is demonstrated. … In conclusion a table-top,
fully tunable HHG beamline with state-of-the-art flux between 50 eV and 70 eV is presented.
This will enable or simplify many applications in spectroscopy, metrology and nanoscale
imaging [1,2,3]. It is the first time that waveguide-based HHG has been achieved with a …

In this work, a continuously tunable extreme ultraviolet source delivering a state-of-the-art
photon flux of> 10^ 11 ph/s/eV spanning from 50 eV to 70 eV is presented. The setup
consists of a high-power fiber laser with a subsequent multipass cell followed by a
waveguide-based high harmonic generation setup. Spectral tuning over the full line spacing
is achieved by slightly adjusting the lasers driving pulse energy, utilizing nonlinear
propagation effects and pulse chirping. The presented method enables a high tuning speed …