A High Intensity Attosecond Light Source in Compact Geometry at ELI ALPS User Facility

TL;DR

The paper introduces a compact high-harmonic beamline at ELI ALPS capable of generating intense attosecond pulses for nonlinear XUV experiments, demonstrated through double ionization of neon and argon.

Contribution

It presents a novel, compact beamline design that delivers high-flux attosecond pulses suitable for nonlinear XUV applications, enabling advanced ultrafast electron dynamics studies.

Findings

Successful generation of intense attosecond pulse trains and isolated pulses.

Demonstration of two-XUV-photon double ionization in neon and argon.

Validation of the beamline's capability for cutting-edge attosecond experiments.

Abstract

High-order harmonic generation (HHG) has become a standard technique for producing attosecond XUV pulses in the laboratory, yet the high flux necessary for nonlinear XUV photoionization remains accessible to only a few research groups. Here, we introduce the SYLOS Compact high-harmonic beamline at ELI ALPS, specifically designed to provide the flux required for non-linear optics in the XUV. We present a detailed characterization of the beam line demonstrating its capability to generate and utilize both intense attosecond pulse trains and isolated attosecond pulses. We further showcase the two-XUV-photon double ionization of neon (Ne) and argon (Ar), achieved in a user campaign. The results underscore the beamline's capability to support cutting-edge attosecond experiments and investigations of ultrafast electron dynamics on the attosecond scale.