240 citations · 1.1k across the 34 of their papers we have counts for
35 papers
Circular Dichroism in Multiphoton Ionization of Resonantly Excited Helium Ions near Channel Closing
Rene Wagner, Markus Ilchen, Nicolas Douguet +16
The circular dichroism (CD) of photoelectrons generated by near-infrared (NIR) laser pulses using multiphoton ionization of excited He ions in the 3p(m=+1) state. The ions were…
Mitigation of the Microbunching Instability Through Transverse Landau Damping
A. D. Brynes, G. Perosa, C. -Y. Tsai +14
The microbunching instability has been a long-standing issue for high-brightness free-electron lasers (FELs), and is a significant show-stopper to achieving full longitudinal coher…
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…
Ultrafast Opto-magnetic Effects in the Extreme Ultraviolet Spectral Range
Martin Hennecke, Clemens von Korff Schmising, Kelvin Yao +20
Coherent light-matter interactions mediated by opto-magnetic phenomena like the inverse Faraday effect (IFE) are expected to provide a non-thermal pathway for ultrafast manipulatio…
Uncovering the nature of transient and metastable non-equilibrium phases in 1-TaS
Tanusree Saha, Arindam Pramanik, Barbara Ressel +7
Complex systems are characterized by strong coupling between different microscopic degrees of freedom. Photoexcitation of such materials can drive them into new transient and long-…
Electronic band structure in pristine and Sulfur-doped TaNiSe
Tanusree Saha, Luca Petaccia, Barbara Ressel +4
We present an angle-resolved photoemission study of the electronic band structure of the excitonic insulator TaNiSe, as well as its evolution upon Sulfur doping. Our experi…
Time-resolved chiral X-Ray photoelectron spectroscopy with transiently enhanced atomic site-selectivity: a Free Electron Laser investigation of electronically excited fenchone enantiomers
D. Faccialà, M. Devetta, S. Beauvarlet +28
Chiral molecules are widespread in nature, playing a fundamental role in bio-chemical processes and in the origin of life itself. The observation of dynamics in chiral molecules is…
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…
Differences in the scaling laws of canonical and microcanonical coarsening dynamics for long-range interacting systems
Fabio Staniscia, Romain Bachelard, Thierry Dauxois +1
We investigate the effects of Hamiltonian and Langevin microscopic dynamics on the growth laws of domains in coarsening. Using a one-dimensional class of generalized models w…
Hidden phase in parent Fe-pnictide superconductors
Khadiza Ali, Ganesh Adhikary, Sangeeta Thakur +9
We investigate the origin of exoticity in Fe-based systems via studying the Fermiology of CaFe2As2 employing Angle Resolved Photoemission spectroscopy (ARPES). While the Fermi surf…
Orbital-dependent electron dynamics in Fe-pnictide superconductors
Ganesh Adhikary, Barbara Ressel, Matija Stupar +6
We report on orbital-dependent quasiparticle dynamics in EuFeAs, a parent compound of Fe-based superconductors and a novel way to experimentally identify this behavior, usi…
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…
Absence of thermalization for systems with long-range interactions coupled to a thermal bath
Pierre de Buyl, Giovanni De Ninno, Duccio Fanelli +4
We investigate the dynamics of a small long-range interacting system, in contact with a large long-range thermal bath. Our analysis reveals the existence of striking anomalies in t…
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…