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View article: Attosecond temporal structure of non-consecutive harmonic combs revealed by multiple near-infrared photon transitions in two-color photoionisation
Attosecond temporal structure of non-consecutive harmonic combs revealed by multiple near-infrared photon transitions in two-color photoionisation Open
The metrology of attosecond pulse trains is based on a cross-correlation technique between a comb of extreme ultraviolet harmonics generated by the high-order harmonic generation process and a synchronised infrared field. The approach, usu…
View article: Magnetic Vortex Dynamics Probed by Time-Resolved Magnetic Helicoidal Dichroism
Magnetic Vortex Dynamics Probed by Time-Resolved Magnetic Helicoidal Dichroism Open
The laser excitation of magnetization dynamics without applying external fields is a topic of high interest for its potential applications (e.g., magnetic memories, oscillators, and THz emitters). We explore the use of an ultrashort infrar…
View article: Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control
Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control Open
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of photon energies. Their revolutionary and innovati…
View article: Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control
Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control Open
Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of accessible photon energies. Their revolutionary a…
View article: Nanoscale polarization transient gratings
Nanoscale polarization transient gratings Open
Light manipulation at the nanoscale is essential both for fundamental science and modern technology. The quest to shorter lengthscales, however, requires the use of light wavelengths beyond the visible. In particular, in the extreme ultrav…
View article: Wave-packet manipulation of He Rydberg states by a seeded free-electron laser
Wave-packet manipulation of He Rydberg states by a seeded free-electron laser Open
We report a two-dimensional pump-control-probe spectroscopic study of the dynamics of singly excited He Rydberg-state wave packets with a seeded extreme ultraviolet (XUV) free-electron laser (FEL) source. A pair of coherent XUV pulses, def…
View article: Circular dichroism experiments at the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:math> edge of magnetic transition metals enabled by elliptically polarized pulses from a seeded free-electron laser
Circular dichroism experiments at the edge of magnetic transition metals enabled by elliptically polarized pulses from a seeded free-electron laser Open
International audience
View article: Mitigation of the microbunching instability through transverse Landau damping
Mitigation of the microbunching instability through transverse Landau damping Open
The microbunching instability has been a long-standing issue for high-brightness free-electron lasers (FELs) and is a significant showstopper to achieve full longitudinal coherence in the x-ray regime. This paper reports the first experime…
View article: Evolution of density-modulated electron beams in drift sections
Evolution of density-modulated electron beams in drift sections Open
Initiating the amplification process in a short-wavelength free-electron laser (FEL) by external seed laser pulses results in radiation with a high degree of longitudinal and transverse coherence. The basic layout in seeded harmonic genera…
View article: Wave packet dynamics and control in excited states of molecular nitrogen
Wave packet dynamics and control in excited states of molecular nitrogen Open
Wave packet interferometry with vacuum ultraviolet light has been used to probe a complex region of the electronic spectrum of molecular nitrogen, N2. Wave packets of Rydberg and valence states were excited by using double pulses of vacuum…
View article: Ultrafast electronic relaxation pathways of the molecular photoswitch quadricyclane
Ultrafast electronic relaxation pathways of the molecular photoswitch quadricyclane Open
View article: Nanoscale transient polarization gratings
Nanoscale transient polarization gratings Open
We present the generation of transient polarization gratings at the nanoscale, achieved using a tailored accelerator configuration of the FERMI free electron laser. We demonstrate the capabilities of such a transient polarization grating b…
View article: Femtosecond Polarization Shaping of Free-Electron Laser Pulses
Femtosecond Polarization Shaping of Free-Electron Laser Pulses Open
We demonstrate the generation of extreme-ultraviolet (XUV) free-electron laser (FEL) pulses with time-dependent polarization. To achieve polarization modulation on a femtosecond timescale, we combine two mutually delayed counterrotating ci…
View article: Uncovering the nature of transient and metastable non-equilibrium phases in 1$T$-TaS$_2$
Uncovering the nature of transient and metastable non-equilibrium phases in 1$T$-TaS$_2$ Open
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-lived hidden phases that may not have any counterparts in e…
View article: Magnetic helicoidal dichroism with XUV light carrying orbital angular momentum
Magnetic helicoidal dichroism with XUV light carrying orbital angular momentum Open
Circularly polarized light is a fundamental tool in magnetic studies, notably for magnetization dynamics. It is less common in magneto-optics to exploit the orbital angular momentum (OAM) of value ℓ carried by light beams possessing a heli…
View article: All-optical spin injection in silicon investigated by element-specific time-resolved Kerr effect
All-optical spin injection in silicon investigated by element-specific time-resolved Kerr effect Open
Understanding how a spin current flows across metal-semiconductor interfaces at pico- and femtosecond time scales is of paramount importance for ultrafast spintronics, data processing, and storage applications. However, the possibility to …
View article: Data for the Attosecond coherent-control experiment at FEL FERMI
Data for the Attosecond coherent-control experiment at FEL FERMI Open
In the excel sheets, data corresponding to the attosecond coherent control experiment has been provided. A word file is included to explain the data in the different excel sheets.
View article: Data for the Attosecond coherent-control experiment at FEL FERMI
Data for the Attosecond coherent-control experiment at FEL FERMI Open
In the excel sheets, data corresponding to the attosecond coherent control experiment has been provided. A word file is included to explain the data in the different excel sheets.
View article: Magneto-optical Kerr effect with twisted light beams: the origin of helicoidal dichroism in the reflection off magnetic vortices
Magneto-optical Kerr effect with twisted light beams: the origin of helicoidal dichroism in the reflection off magnetic vortices Open
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View article: Electronic band structure in pristine and Sulfur-doped Ta$_2$NiSe$_5$
Electronic band structure in pristine and Sulfur-doped Ta$_2$NiSe$_5$ Open
We present an angle-resolved photoemission study of the electronic band structure of the excitonic insulator Ta$_2$NiSe$_5$, as well as its evolution upon Sulfur doping. Our experimental data show that while the excitonic insulating phase …
View article: Nonlinear harmonics of a seeded free-electron laser as a coherent and ultrafast probe to investigate matter at the water window and beyond
Nonlinear harmonics of a seeded free-electron laser as a coherent and ultrafast probe to investigate matter at the water window and beyond Open
The advent of free-electron lasers (FELs) in the soft- and hard-x-ray spectral regions has introduced the possibility to probe electronic, magnetic, and structural dynamics, in both diluted and condensed matter samples, with femtosecond ti…
View article: Interference of two-photon transitions induced by XUV light
Interference of two-photon transitions induced by XUV light Open
The relative phase of first ( ) and third harmonics ( ) extreme ultraviolet light pulses was varied to control the population of the state in helium through the interference of and two-photon excitation …
View article: Single-shot transverse coherence in seeded and unseeded free-electron lasers: A comparison
Single-shot transverse coherence in seeded and unseeded free-electron lasers: A comparison Open
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-amplifi…
View article: Addendum: Experimental evidence of intrabeam scattering in a free-electron laser driver (2020 New J. Phys. 22 083053)
Addendum: Experimental evidence of intrabeam scattering in a free-electron laser driver (2020 New J. Phys. 22 083053) Open
A conceptual inaccuracy in the calculation of energy spread induced by intrabeam scattering in the presence of linear acceleration is put in evidence. A new self-consistent equation is presented. Two new solutions are provided in the appro…
View article: Observation of Magnetic Helicoidal Dichroism with Extreme Ultraviolet Light Vortices
Observation of Magnetic Helicoidal Dichroism with Extreme Ultraviolet Light Vortices Open
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 magnetic vortex. Numerical simulations based on classical e…
View article: Magnetic Helicoidal Dichroism with XUV Light Carrying Orbital Angular Momentum
Magnetic Helicoidal Dichroism with XUV Light Carrying Orbital Angular Momentum Open
We report magnetic helicoidal dichroism (MHD) in the interaction between XUV beams carrying orbital angular momentum and magnetic vortices. The results match theoretical predictions and confirm the potential of MHD for studying laser-trigg…
View article: All-optical spin injection in silicon revealed by element specific time-resolved Kerr effect
All-optical spin injection in silicon revealed by element specific time-resolved Kerr effect Open
Understanding how a spin current flows across metal-semiconductor interfaces at pico- and femtosecond timescales has implications for ultrafast spintronics, data processing and storage applications. However, the possibility to directly acc…
View article: Enhancement of Above Threshold Ionization in Resonantly Excited Helium Nanodroplets
Enhancement of Above Threshold Ionization in Resonantly Excited Helium Nanodroplets Open
Clusters and nanodroplets hold the promise of enhancing high-order nonlinear optical effects due to their high local density. However, only moderate enhancement has been demonstrated to date. Here, we report the observation of energetic el…
View article: Characterization of soft x-ray echo-enabled harmonic generation free-electron laser pulses in the presence of incoherent electron beam energy modulations
Characterization of soft x-ray echo-enabled harmonic generation free-electron laser pulses in the presence of incoherent electron beam energy modulations Open
Echo-enabled harmonic generation free-electron lasers (EEHG FELs)are promising candidates to produce fully coherent soft x-ray pulses by virtue of efficient high harmonic frequency up-conversion from UV lasers.The ultimate spectral limit o…
View article: An approach for realizing four-wave-mixing experiments stimulated by two-color extreme ultraviolet pulses
An approach for realizing four-wave-mixing experiments stimulated by two-color extreme ultraviolet pulses Open
The advent of extreme ultraviolet (EUV) and soft X-ray free electron lasers (FELs) has enabled nonlinear optical experiments at wavelengths shorter than the visible-UV range. An important class of experiments is those based on the four-wav…