Abstract
We report on a compact high-photon-flux extreme ultraviolet (XUV) source based on high harmonic generation. A high XUV-photon flux (>1013 photons/s) is achieved at 21.8 eV and 26.6 eV. The narrow spectral bandwidth (ΔE/E < 10−3) of the generated harmonics is in the range of state-of-the-art synchrotron beamlines and enables high resolution spectroscopy experiments. The robust design based on a fiber–laser system enables turnkey-controlled and even remotely controlled operation outside specialized laser laboratories, which opens the way for a variety of applications.
Highlights
In contrast to the typically short pulse duration and corresponding broad bandwidth of high harmonic generation (HHG) sources, there are a number of applications in spectroscopy which require a narrow spectral bandwidth at XUV wavelengths
The generated high order harmonics are separated from the driving laser by grazing incidence plates (GIPs)22 and two 1 μm thick aluminum filters
The reflectivity of the GIP in the respective XUV wavelength range varies between 50% and 56%
Summary
The rapid development of table-top ultrafast laser systems over the last decade has enabled the scientific community to perform a significant number of experiments that were formerly confined to large scale facilities such as free-electron lasers (FEL) and synchrotrons.1–3 Among others, the development of high harmonic generation (HHG) sources opened access to photon hungry applications that require laser like extreme ultraviolet (XUV) radiation.4–8 In particular, the ultrashort pulse duration paired with a high photon flux is a unique property of these sources.9 In contrast to the typically short pulse duration and corresponding broad bandwidth of HHG sources, there are a number of applications in spectroscopy which require a narrow spectral bandwidth at XUV wavelengths. XUV and x-ray photon energies, a narrow bandwidth, and a high photon flux.17 the latest generation of high-harmonic sources appears powerful enough to enable such studies with tabletop light sources, e.g., in combination with heavy ion storage rings or ion traps.18 the requirements on the source are demanding, and the combination of a high photon flux and a narrow spectral bandwidth has not yet been achieved. Scitation.org/journal/adv in combination with a narrow energy bandwidth.9,22 By decreasing the driving wavelength of the high harmonic process, the spectral bandwidth of the created harmonics is reduced due to improved phase matching.
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