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]

High-average-power 2 µm few-cycle optical parametric chirped pulse amplifier at 100 kHz repetition rate

Sources of long wavelengths few-cycle high repetition rate pulses are becoming increasingly important for a plethora of applications, e.g., in high-field physics. Here, we report on the realization of a tunable optical parametric chirped pulse amplifier at 100 kHz repetition rate. At a central wavelength of 2 μm, the system delivered 33 fs pulses and a 6 W average power corresponding to 60 μJ pulse energy with gigawatt-level peak powers. Idler absorption and its crystal heating is experimentally investigated for a BBO. Strategies for further power scaling to several tens of watts of average power are discussed

Milliwatt-class high harmonic generation with an high average power short wavelength fiber laser

Summary form only given. Table-top extreme ultraviolet (XUV) light sources with laser like properties are of interest in a vast variety of applications. To achieve such light pulses with femtosecond pulse durations, high harmonic generation (HHG) is an established technique. It delivers ultrashort pulses and a wide range of photon energies, suitable for the study of core level transitions, highly excited states, or transitions in highly-charged ions [1], as well as for experiments in solid state physics such as photoelectron spectroscopy [2]. To achieve short acquisition times as well as acceptable signal to noise ratios, a high repetition rate and high photon flux is beneficial. Therefore, average power scalable fiber-based lasers are an ideal driver [3]. Since the HHG single atom response scales with ~λ -5.5 [4] and phase matching conditions are more beneficial for a shorter driving wavelength, a much higher overall conversion efficiency can be achieved for short wavelength drivers [5]. By using the second harmonic of an infrared laser for HHG we demonstrate the highest average power high harmonic source to date. This cascaded frequency conversion yields a record high average power of (832 + 204) μW, contained in a single harmonic line at 21.7 eV with a relative energy bandwidth of ΔE/E ≈ 10 -2 , shown in Fig. 1a) [6]