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AC/DC: The FERMI FEL Split and Delay Optical Device for Ultrafast X-ray Science
| Content Provider | MDPI |
|---|---|
| Author | Simoncig, Alberto Manfredda, Michele Gaio, Giulio Mahne, Nicola Raimondi, Lorenzo Fava, Claudio Gerusina, Simone Gobessi, Riccardo Abrami, Alessandro Capotondi, Flavio Angelis, Dario De Menk, Ralf Hendrik Pancaldi, Matteo Pedersoli, Emanuele Zangrando, Marco |
| Copyright Year | 2022 |
| Description | Free-electron lasers (FELs) are the most advanced class of light-sources, by virtue of their unique capability to lase high-brightness pulses characterized by wavelengths spanning the extreme-ultraviolet, the soft and hard X-ray spectral domains, as well as by temporal lengths lying in the femtosecond (fs) timescale. The next step to push the current standards in ultrafast X-ray science is strongly linked to the possibility of engineering and exploiting time-resolved experiments exclusively for FELs pulses, ideally having different colors tunable at specific electronic resonance of the chemical elements. At the seeded FERMI FEL (Trieste, Italy) this goal is committed to the optical device known as AC/DC, which stands for the auto correlator/delay creator. AC/DC is designed to double the incoming FEL pulse splitting the photon beam by inserting a grazing incidence flat mirror, thus preserving the spectral and temporal properties, and further delaying one of these two pulses in time. It can independently tune the FEL pulses fluence on the two optical paths by means of solid-state filters, too. Here, we present a detailed description about this optical device. Strong emphasis is dedicated to the AC/DC opto-mechanical design and to the laser-based feedback systems implemented to compensate for any mismatch affecting the FEL optical trajectory, ascribable to both mechanical imperfections and paraxial errors rising during a temporal delay scan. |
| Starting Page | 314 |
| e-ISSN | 23046732 |
| DOI | 10.3390/photonics9050314 |
| Journal | Photonics |
| Issue Number | 5 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-05 |
| Access Restriction | Open |
| Subject Keyword | Photonics Free-electron Lasers Ultrafast X-ray Pulses Cross-correlated X-ray Experiment Split and Delay Optical Devices: Non-linear Optics Physical Optics Optical Feedback |
| Content Type | Text |
| Resource Type | Article |
