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

2025/07/03 by Späthe, Julian, Hell, Sebastian, Wünsche, Martin +6
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2507.02561

Abstract

We present a source of coherent extreme ultraviolet (XUV) radiation with a flux of 10¹³ 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.

Citations

• Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance
• Compact realization of all-attosecond pump-probe spectroscopy
• Efficient generation of high-order harmonics in gases
• Theory of high-harmonic generation by low-frequency laser fields
• Multiple-harmonic conversion of 1064 nm radiation in rare gases

Related

• Intense narrowband XUV pulses from a compact setup
• Enhanced high-order harmonic generation driven by a wavefront corrected high-energy laser
• Generation of energetic highly elliptical extreme ultraviolet radiation
• Technical design report of a complete and compact broadband high-harmonics femtosecond beamline based on a modular hollow waveguide for photons generation centered on the upper region of the extreme ultraviolet spectral range
• Highly nonlinear ionization of atoms induced by intense high-harmonic\n pulses