Laser-driven high-flux source of coherent quasi-monochromatic extreme ultraviolet radiation for coincidence spectroscopy

TL;DR

This paper introduces a high-flux, coherent XUV source based on high-harmonic generation in argon, enabling advanced coincidence spectroscopy and pump-probe experiments with high temporal resolution.

Contribution

The work presents a novel high-flux, quasi-monochromatic XUV source with 10^13 photons/sec at 26.5 eV, suitable for coincidence spectroscopy and ultrafast pump-probe studies.

Findings

Achieved a flux of 10^13 photons/sec at 26.5 eV.

Demonstrated coincidence spectroscopy of ions and electrons.

Enabled pump-probe experiments with XUV and visible pulses.

Abstract

We present a source of coherent extreme ultraviolet (XUV) radiation with a flux of 10$^{13}$ photons per second at 26.5 eV. The source is based on high-harmonic generation (HHG) in argon and pumped by a frequency-doubled 100 kHz repetition rate fiber laser providing 30 fs pulses centered at 515 nm. We report on the characterization of the source and the generated XUV radiation using optical imaging and photoelectron spectroscopy. The generated radiation is quasi-monochromatized using a suitably coated XUV mirror and used for coincidence spectroscopy of ions and electrons generated from a cold gas target. The high intensity of the focused XUV pulses is confirmed by the observation of two-photon double ionization in argon. Moreover, we demonstrate the capability to perform pump-probe experiments using XUV and visible laser pulses.