240 citations · 1.1k across the 34 of their papers we have counts for
16 papers · 1 filter
High-resolution ptychographic imaging at a seeded free-electron laser source using OAM beams
M. Pancaldi, F. Guzzi, C. S. Bevis +21
Electromagnetic waves possessing orbital angular momentum (OAM) are powerful tools for applications in optical communications, new quantum technologies and optical tweezers. Recent…
Observation of magnetic helicoidal dichroism with extreme ultraviolet light vortices
Mauro Fanciulli, Matteo Pancaldi, Emanuele Pedersoli +17
We report on the experimental evidence of magnetic helicoidal dichroism, observed in the interaction of an extreme ultraviolet vortex beam carrying orbital angular momentum with a…
Coherent control with a short-wavelength Free Electron Laser
K. C. Prince, E. Allaria, C. Callegari +37
XUV and X-ray Free Electron Lasers (FELs) produce short wavelength pulses with high intensity, ultrashort duration, well-defined polarization and transverse coherence, and have bee…
Tunable orbital angular momentum in high-harmonic generation
D. Gauthier, P. Rebernik Ribič, G. Adhikary +14
Optical vortices are currently one of the most intensively studied topics in optics. These light beams, which carry orbital angular momentum (OAM), have been successfully utilized…
Spectro-temporal shaping of seeded free-electron laser pulses
David Gauthier, Primož Rebernik Ribič, Giovanni De Ninno +8
We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over th…
Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers
Benoît Mahieu, David Gauthier, Giovanni De Ninno +6
We present a setup for complete characterization of femtosecond pulses generated by seeded free-electron lasers (FEL's) in the extreme-ultraviolet spectral region. Two delayed and…
Generation of Coherent Extreme-Ultraviolet Radiation Carrying Orbital Angular Momentum
Primož Rebernik Ribič, David Gauthier, Giovanni De Ninno
We propose an effective scheme for the generation of intense coherent extreme ultraviolet light beams carrying orbital angular momentum (OAM). The light is produced by a high-gain…
CITIUS: an IR-XUV light source for fundamental and applied ultrafast science
C. Grazioli, C. Callegari, A. Ciavardini +15
We present the main features of CITIUS, a new light source for ultrafast science, generating tunable, intense, femtosecond pulses in the spectral range from IR to XUV. The XUV puls…
Two-colour generation in a chirped seeded Free-Electron Laser
B. Mahieu, E. Allaria, D. Castronovo +17
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 operati…
Direct Spectro-Temporal Characterization of Femtosecond Extreme-Ultraviolet Pulses
David Gauthier, Benoît Mahieu, Giovanni De Ninno
We propose a method for a straightforward characterization of the temporal shape of femtosecond pulses in the extreme-ultraviolet/soft X-ray spectral region. The approach is based…
Chirped seeded free-electron lasers: self-standing light sources for two-colour pump-probe experiments
Giovanni De Ninno, Enrico Allaria, Benoit Mahieu
We demonstrate the possibility to run a single-pass free-electron laser in a new dynamical regime, which can be exploited to perform two-colour pump-probe experiments in the VUV/X-…
Fully-tunable femtosecond laser source in the ultraviolet spectral range
B. Mahieu, S. Coraggia, C. Callegari +10
We demonstrate experimentally the full tunability of a coherent femtosecond source in the whole ultraviolet spectral region. The experiment relies on the technique of high-order ha…
VUV and X-ray coherent light with tunable polarization from single-pass free-electron lasers
C. Spezzani, E. Allaria, B. Diviacco +6
Tunable polarization over a wide spectral range is a required feature of light sources employed to investigate the properties of local symmetry in both condensed and low-density ma…
Experimental demonstration of frequency pulling in single-pass free-electron lasers
E. Allaria, C. Spezzani, G. De Ninno
Frequency pulling is a well-known phenomenon in standard laser physics, leading to a shift of the laser frequency when the cavity and maximum gain frequencies are detuned. In this…
Angular Distribution of Nonlinear Harmonic Generation in Helical Undulators: a comparison between experiments and theory
E. Allaria, G. De Ninno, G. Geloni +1
Using harmonic emission from circularly polarized undulator is a procedure that is normally employed on synchrotron beamlines in order to extend the covered spectral range. A simil…
Chaotic dynamics in a storage-ring Free Electron Laser
G. De Ninno, D. Fanelli, C. Bruni +1
The temporal dynamics of a storage-ring Free Electron Laser is here investigated with particular attention to the case in which an external modulation is applied to the laser-elect…