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Sökning: WFRF:(Perosa G.)

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1.
  • Perosa, G., et al. (författare)
  • Femtosecond Polarization Shaping of Free-Electron Laser Pulses
  • 2023
  • Ingår i: Physical Review Letters. - 0031-9007. ; 131:4
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate the generation of extreme-ultraviolet (XUV) free-electron laser (FEL) pulses with timedependent polarization. To achieve polarization modulation on a femtosecond timescale, we combine two mutually delayed counterrotating circularly polarized subpulses from two cross-polarized undulators. The polarization profile of the pulses is probed by angle-resolved photoemission and above-threshold ionization of helium; the results agree with solutions of the time-dependent Schrodinger equation. The stability limit of the scheme is mainly set by electron-beam energy fluctuations, however, at a level that will not compromise experiments in the XUV. Our results demonstrate the potential to improve the resolution and element selectivity of methods based on polarization shaping and may lead to the development of new coherent control schemes for probing and manipulating core electrons in matter.
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2.
  • Pop, Mihai, et al. (författare)
  • Single-shot transverse coherence in seeded and unseeded free-electron lasers: A comparison
  • 2022
  • Ingår i: Physical Review Accelerators and Beams. - 2469-9888. ; 25:040701
  • Tidskriftsartikel (refereegranskat)abstract
    • The advent of x-ray free-electron lasers (FELs) drastically enhanced the capabilities of several analytical techniques, for which the degree of transverse (spatial) coherence of the source is essential. FELs can be operated in self-amplified spontaneous emission (SASE) or seeded configurations, which rely on a qualitatively different initialization of the amplification process leading to light emission. The degree of transverse coherence of SASE and seeded FELs has been characterized in the past, both experimentally and theoretically. However, a direct experimental comparison between the two regimes in similar operating conditions is missing, as well as an accurate study of the sensitivity of transverse coherence to key working parameters. In this paper, we carry out such a comparison, focusing in particular on the evolution of coherence during the light amplification process.
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