Krypton clusters
Krypton clusters

Krypton clusters—produced from supersonic expansion in vacuum (center) of krypton gas from a high-pressure nozzle (top)—are irradiated by a high-power, few-cycle laser (right) to produce soft X-rays, emitted in all directions. X-rays going through the vacuum-chamber differential pumping hole (left) are detected by a soft-X-ray spectrometer (Optica, doi: 10.1364/OPTICA.471084).

[OPN 2022 Photo Contest Editors’ Choice]

—Pierre-Alexis Chevreuil, Ultrafast Laser Physics  Group, ETH Zurich, Zurich, Switzerland

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