Abstract
We present the experimental demonstration of a method for generating two spectrally and temporally separated pulses by an externally seeded, single-pass free-electron laser operating in the extreme-ultraviolet spectral range. Our results, collected on the FERMI@Elettra facility and confirmed by numerical simulations, demonstrate the possibility of controlling both the spectral and temporal features of the generated pulses. A free-electron laser operated in this mode becomes a suitable light source for jitter-free, two-colour pump-probe experiments.
Highlights
Chirped pulse modulation is a widely used technique, with relevant applications in several fields of research, ranging from digital communication [1] to radar detection [2], and from optics [3] to laser physics
The paper is divided into the following parts: in Section 1 we introduce the principle upon which a coherent harmonic generation (CHG) free-electron laser (FEL) is based, with specific reference to the case of the FERMI@Elettra FEL [17]
As we remarked in the previous section, a linear energy chirp of the electron energy induces a spectral shift of the FEL emission
Summary
Chirped pulse modulation is a widely used technique, with relevant applications in several fields of research, ranging from digital communication [1] to radar detection [2], and from optics [3] to laser physics. Frequency chirping is employed to stretch a short pulse prior to amplification. We characterize the performance of a seeded FEL where frequency chirping on the seed laser is instead exploited to generate two independent pulses spectrally and temporally separated in an externally controllable fashion. At FERMI@Elettra, multiple pulses have been obtained recently with a different technique, based on the simultaneous injection of two different seed pulses on the same electron bunch [11]. In this case the two pulses minimum separation is limited by the seed pulse length. We summarize our conclusions and provide some perspectives for future experimental studies
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
