Table-Top Milliwatt-Class Extreme Ultraviolet High Harmonic Light Source

Extreme ultraviolet (XUV) lasers are essential for the investigation of fundamental physics. Especially high repetition rate, high photon flux sources are of major interest for reducing acquisition times and improving signal to noise ratios in a plethora of applications. Here, an XUV source based on cascaded frequency conversion is presented, which delivers due to the drastic better single atom response for short wavelength drivers, an average output power of (832 +- 204) {\mu}W at 21.7 eV. This is the highest average power produced by any HHG source in this spectral range surpassing precious demonstrations by more than a factor of four. Furthermore, a narrow-band harmonic at 26.6 eV with a relative energy bandwidth of only {\Delta}E/E= 1.8 x 10E-3 has been generated, which is of high interest for high precision spectroscopy experiments.Comment: 4 Pages, 4 Picture

A Compact Tunable Narrow-Bandwidth and High-Photon-Flux Turnkey XUV Source for Experiments with Highly Charged Ions at Storage Rings

The development of table-top extreme ultraviolet (XUV) light sources has paved the way to a vast variety of applications. Achievable XUV-photon fluxes of lab scale high-harmonic XUV setups can reach up to those typically present at synchrotron sources and free-electron lasers (FELs) [1]. Thus, a variety of experiments comes into reach that was formerly tied to these large scale facilities. The combination of the table-top type XUV sources combined with heavy ion storage rings enables manifold fundamental studies and experiments on core level transitions, highly excited states, or transitions in highly-charged ions [2]

Multi-GW, 100 fs thulium-doped fiber laser system for high-harmonic generation at high repetition rates

Intense, ultrafast laser systems with an emission wavelength at around 2 μm have become popular tools for many scientific research activities such as nonlinear frequency conversion into the long-wave mid-infrared as well as the soft X-ray spectral region, in order to address numerous subsequent applications. There is, however, a strong application-driven demand for an increase in photon-flux, i.e. repetition rate and average power, of the driving laser systems. Thulium-doped fiber lasers are an average-power scalable laser concept at around 2 μm emission wavelength. They have been demonstrated with >100 W average power and show great promise to deliver peak powers of several tens of GW. Another advantage is the large gain bandwidth offered by Tm-doped fused silica, spanning from 1.8-2 μm