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An ordinary camera flash lasts a thousandth of a second. The new setup at the ELI ALPS laboratory in Hungary produces flashes a billion times shorter. Each flash consists of a few hundred oscillations of the light wave, packed into a time interval in which light travels a distance smaller than the thickness of a human hair.

Light this bright can knock out not one but two electrons from atoms. In the experiment, neon and argon, inert gases that usually cling to their electrons, were bombarded. But under the onslaught of the ultrashort flashes, the atoms gave in: two electrons left them simultaneously. It's as if a single hammer blow made a gong produce not one sound but two different tones at once.

The room-sized device does what previously only giant accelerators could do. Now, short and powerful light flashes are no longer limited to a select few laboratories. This opens the door to filming ultrafast processes — for example, how electrons rearrange during a chemical reaction. This 'camera' shoots trillions of frames per second, and in every frame you can see the motion of an electron.

Original abstract

as written by the authors arXiv:2601.09608

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.