Advances in Free-Electrons Laser Experiments

Dear Colleagues,

The last few decades have witnessed the development of free electron lasers (FELs) operating in the infrared, extreme ultraviolet (EUV) and the X-ray regimes. These novel light sources combine ultrafast time structure, high coherence and brightness, previously achievable only by optical lasers, with photon energies suitable for a broad range of applications, including nanoscale imaging, atomic-scale diffraction, THz and core-level spectroscopies.

Such unique features of FELs have triggered the development of experimental approaches for time-domain investigation in the X-ray and EUV range, and have also stimulated theoretical efforts for describing ultrafast and high-field processes. These new tools have been exploited by scientists from many disciplines, ranging from atomic and molecular physics to chemistry, biology and material science, and have permitted the achievement of outstanding results in both fundamental and applied science. Moreover, the complexity in properly tackling FEL-based experiment has triggered new synergies with the community of accelerator physicists, which nowadays proactively work for realizing the next steps into this exciting field.  

This Special Issue is dedicated to researchers who intend to contribute with original research articles and reviews to the development of FEL sources and to their use for state-of-the-art experiments on different matter samples. Our hope is to provide a source of inspiration to all scientists working in related fields, such as those based on ultrafast table-top lasers, high-harmonic generation and synchrotrons operated in time-resolved mode.  

Dr. Filippo Bencivenga
Prof. Dr. Giovanni De Ninno
Guest Editors

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• Free electron lasers
• Time-resolved methods
• Ultrafast magnetism
• Structural dynamics
• Nonlinear optics