Extreme-Ultraviolet and X-ray Optics

Dear Colleagues,

Laser-driven extreme ultraviolet (XUV) and X-ray sources are continuously advancing, enabling innovative experiments in groundbreaking research areas. Among the recent advancements in the development and applications of XUV and X-ray sources, we can cite gas high harmonic generation (GHHG) beamlines emitting intensities high enough to induce observable non-linear and strong field effects in XUV and soft X-ray spectral regions; Mid-IR laser-driven GHHG sources reaching wavelengths beyond the water window at high repetition rates to facilitate kinematically complete coincidence experiments; laser-driven surface high harmonic generation (SHHG) sources which aim to intense X-ray emission allowing time-resolved diffraction experiments with sub-nm/attosecond spatiotemporal resolution; and harmonic generation in crystals introducing the topic of picoscopy of electrons in solids.

The extreme operational parameters of these sources, such as the short pulse duration, the high peak and/or average intensities, and the wave-front properties put high demand on XUV and X-ray optics, including materials, coatings, focusing/steering elements, filters, sensors, detectors, delay lines, and spectrometers, to mention a few. The advancement of the sources has acted as a driver of enormous progress in the development and applications of novel XUV and X-ray optics. Some of these developments are also pertinent to other XUV and X-ray sources, i.e., free electron lasers and synchrotrons. Others are specific to laser-driven sources and research infrastructures, for example, Extreme Light Infrastructure, Laserlab Europe, and Attolab.

The aim of this Special Issue is to provide an overview of the state of the art in XUV and X-ray optics of laser-based laboratories, from the point of view of the development of technologies, methods, and instrumentation, as well as of their utilization in cutting-edge experiments and visions toward future breakthroughs.

Prof. Dr. Dimitris Charalambidis
Dr. Poletto Luca
Prof. Dr. Philippe Zeitoun
Guest Editors

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