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Henry Chapman (CFEL DESY)5/20/26, 9:15 AMInvited talk
If the amplitude and phase of a coherently scattered monochromatic wave can be measured or determined, then that wave can be numerically propagated backwards in time to form a map of the interaction of the wave with an object (i.e. an image). The phase of the wave can often be inferred from a measurement of the intensity pattern alone. This is particularly useful for imaging with X-rays, where...
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Wilhelm Eschen (CU Boulder, JILA)5/20/26, 9:50 AMInvited talk
Recent advances in ultrafast laser technology have facilitated the development of high-brightness, high-order harmonic generation (HHG) sources. These compact tabletop systems now enable high-resolution coherent diffractive imaging (CDI) experiments previously restricted to large-scale facilities [1, 2]. To date, HHG-based imaging has been largely confined to the EUV spectral range (<100 eV),...
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Abraham Lewis Levitan (Paul Scherrer Institute)5/20/26, 10:25 AMContributed talk
Stroboscopic imaging is a popular use of free electron lasers (FELs), enabling studies following the dynamics of a variety of systems ranging from fast-moving objects [1] to ultrafast magnetic dynamics [2]. However, these methods face a fundamental limitation: that each flash of light from the FEL produces a single image. Therefore, to stitch together a full movie of a time-dependent process,...
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Igor Vaskivskyi (Jozef Stefan Institute)5/20/26, 11:10 AMInvited talk
Metastable and long lived hidden electronic orders in quantum materials are rapidly emerging as platforms for next generation technologies, ranging from ultrafast low power memory, quantum information architectures to advanced lithography and tunable X ray optics. However, materials capable of sustaining such persistent phases remain rare, and the microscopic mechanisms that stabilize them are...
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Dr Jaroslav Nejdl (Extreme Light Infrastructure ERIC)5/20/26, 12:20 PMContributed talk
Laser-driven XUV and X-ray sources provide versatile tools for ultrafast science and open new opportunities for nonlinear methods at short wavelengths. At ELI Beamlines, we are developing a complementary suite of laser-driven sources spanning coherent XUV high-harmonic generation (HHG), characteristic Cu Kα emission, and broadband hard X-ray betatron radiation. The HHG beamline is driven by...
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Allan Johnson (IMDEA Nanoscience)5/20/26, 2:15 PMInvited talk
Nonlinear imaging has become a powerful and widespread tool for improving the spatial resolution or selectivity of microscopy tools in the visible and infrared spectral range. Only recently has non-linear X-ray science progress to the point where imaging using wavemixing processes can reasonably be contemplated. Here I will discuss how non-linear X-ray imaging can be realized using coherent...
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Daniel Adams (Colorado School of Mines)5/20/26, 2:50 PMInvited talk
Recent advances in computational imaging are reshaping ultrafast measurement, making it possible to recover information that is difficult or impossible to access with conventional imaging or pump–probe approaches alone. In this talk, I discuss progress over the past five years at the intersection of computational microscopy, electric-field metrology, and algorithm development, with an emphasis...
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Hung-Tzu Chang (Max Planck Institute for Multidisciplinary Sciences)5/20/26, 3:25 PMContributed talk
Investigating ultrafast dynamics and transport phenomena at the nanoscale necessitates simultaneously achieving both femtosecond temporal and nanometer spatial resolution in the probe, which has proven to be challenging up to the present day. Using a femtosecond coherent extreme ultraviolet source via high harmonic generation, we demonstrate subwavelength imaging of magnetic domains of...
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Alessandra Milloch (Elettra Sincrotrone Trieste)5/20/26, 3:50 PMContributed talk
V2O3 is a prototypical Mott insulator in which the first-order insulator-to-metal transition (IMT) is accompanied by a symmetry-breaking lattice distortion. In the low-temperature insulating-antiferromagnetic-monoclinic phase, the breaking of three-fold rotational symmetry generates an intrinsic nanotexture composed of differently oriented domains [1]. This nanoscale texture plays a central...
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Yuhe Zhang (Lund University)5/20/26, 4:30 PMInvited talk
The rapid development of high-brilliance X-ray sources, including diffraction-limited storage rings and X-ray free-electron lasers, is enabling X-ray imaging at unprecedented spatial and temporal resolution. At the same time, these facilities generate increasingly large and often highly undersampled datasets, creating challenges for image reconstruction and analysis. In this talk, I will...
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Dr Marisel Di Pietro Martínez (LCPMR)5/20/26, 5:05 PMInvited talk
The ongoing upgrade of synchrotrons to 4th generation, offering higher brilliance and coherence, creates a valuable opportunity to enhance the penetration depth and sensitivity of coherence-based X-ray techniques. This improvement particularly benefits the detection of weak dichroic signals from magnetic materials, relevant across fields from condensed matter to biology. Visualizing the...
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Prof. Majed Chergui (Elettra-Sincrotrone)5/21/26, 8:45 AMInvited talk
Molecular chirality is central to biology and chemistry. Identification of enantiomers of chiral molecules is mostly based on optical circular dichroism (CD). It measures the absorption difference of left and right circularly polarised light by the sample. CD signals are intrinsically weak, usually 0.1% of the linear absorption, which makes them challenging to measure. Pushing CD spectroscopy...
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Prof. Matjaz Zitnik (J. Stefan Institute)5/21/26, 9:20 AMInvited talk
We have detected self-amplified spontaneous emission (ASE) from 3a
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$^1P^o$ doubly excited state (DES) in He. In an isolated atom, this
autoionizing resonance features a small $5\times 10^{-4}$ branching for
fluorescence decay, preferably populating the singlet 1s3s singly
excited state. To locate FEL wavelengths resonant with DES, the
microfluidic gas cell was modified by adding the two... -
Maksim Radionov (Brandenburg University of Technology)5/21/26, 9:55 AMContributed talk
Improving our understanding of electron dynamics is essential for advancing energy transfer, optoelectronics, light-harvesting systems, and quantum computing. Recent developments in attosecond x-ray sources provide the fundamental possibility of observing these dynamics with atomic-scale spatial resolution. However, connecting a time-resolved signal to the dynamics remains challenging due to...
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Dorothee Mader (Fritz-Haber-Institut der Max-Planck-Gesellschaft)5/21/26, 10:20 AMContributed talk
In this talk infrared-visible sum-frequency generation (SFG) spectro-microscopy using the FHI-FEL is introduced. This method combines benefits from second harmonic generation imaging such as local information on structural symmetry and benefits from sum-frequency generation spectroscopy such as details of the atomic structure and bonding via vibrational resonances.
We demonstrate an...
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Kayn Forbes (University of East Anglia)5/21/26, 11:00 AMInvited talk
Structured light allows us to move far beyond the simple plane waves that underpin most of optics, introducing twist, structure, and topology into the electromagnetic field. This added complexity is not just aesthetic – it opens new ways of controlling how light interacts with matter.
In this talk, I will give a broad overview of what structured light brings to the table, and then focus on...
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Dr Thierry Ruchon (LIDYL, CEA-Saclay)5/21/26, 11:35 AMInvited talk
Synopsis: Optical probing of magnetization dynamics has traditionally relied on analyzing the polarization of plain Gaussian beams. Recently, we introduced a novel approach – Magnetic Helicoidal Dichroism (MHD) – based on analyzing the reflectivity of beams with twisted wavefronts, i.e., beams carrying orbital angular momentum.
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While the spin angular momentum of light is widely used in... -
Michele Manfredda (ELETTRA)5/21/26, 12:10 PMContributed talk
KAOS (Kirkpatrick–Baez Active Optical System) has been a long-standing companion of the FERMI Free Electron Laser and, more broadly, of the XEUV community, evolving together with the scientific questions it was meant to address. Conceived, developed and continuously refined within PADReS, KAOS was initially designed as an adaptive optical system aimed at achieving—and preserving—the best...
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Christian David (Paul Scherrer Institut)5/21/26, 2:15 PM
Diffractive optics have interesting properties that make them highly attractive for use with X-ray and EUV radiation. In contrast to other kinds of x-ray optics such as mirrors and lenses, diffractive optics allow for precise control of the optical wave front and the realization of complex optical functionalities. Applications range from time dispersive elements for single-shot demagnetization...
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Jake Koralek (Stanford / SLAC)5/21/26, 2:50 PMInvited talk
Interfaces between different phases or materials are where all the action is. Solid and liquid interfaces are central to chemical and biological as well as technological and industrial processes, yet their molecular level structure and functioning are difficult to directly study for a variety of reasons. In this talk I will discuss the use of nonlinear X-ray spectroscopy as a direct probe of...
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Anna Bergamaschi (Paul Scherrer Institut)5/21/26, 3:25 PMInvited talk
The customization of Low-Gain Avalanche Diode (LGAD) sensors, originally developed for high-energy physics, to detect soft X-rays promises significant performance improvements over state-of-the-art low-energy detectors in terms of sensitivity, speed, and radiation hardness. By combining the intrinsic internal gain of LGADs with a thin entrance window optimized for high quantum efficiency,...
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29. Nanoscale coherent surface phonon XUV spectroscopy of optically-induced phase transition in FeRhDr Naman Agarwal (Elettra - Sincrotrone Trieste S. c. p. A.)5/21/26, 4:00 PMContributed talk
The observation of ultrafast manipulation and coherent control of spins in magnetic materials at room temperature has prompted the intense experimental and theoretical efforts to understand the underlying microscopic mechanisms and relevant interactions (exchange, spin-lattice, electron-phonon, coulomb etc.) driving such magnetic phenomena at picosecond timescales.
Stoichiometric B2 ordered...
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Enrico Massimiliano Allaria (Elettra Sincrotrone Trieste)Poster
With the completion of the early phase of the FERMI 2.0 upgrade program, the FERMI facility has significantly increased its flexibility, enabling an important extension of its operational capabilities. The redefined FEL-1 layout, supporting both HGHG and EEHG operation modes, has substantially broadened the FEL-1 tuning range. This advancement is accompanied by improved spectral brightness and...
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Emanuele Pedersoli (Elettra - Sincrotrone Trieste)Poster
We report about the recent progress in imaging experiments performed at the DiProI end-station [1], the Coherent Diffraction Imaging (CDI) instrument of the FERMI seeded Free Electron Laser (FEL) user facility [2].
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The mini-TIMER split and delay unit [3] offers the possibility to tomographically illuminate the sample from two different view angles, for stereoscopic imaging [4].
Several... -
Filippo Bencivenga (Elettra-Sincrotrone Trieste)Poster
Collective dynamics at the nanoscale in condensed matter is important for advancing both fundamental science and modern technology. The study of heat transport processes, vibrational modes or magnetization dynamics in the sub-100 nm length-scales greatly benefit from experimental tools able to probe such dynamics on the relevant timescale (i.e. ps and sub-ps) without relying on ad hoc sample’s...
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Marco Zangrando (Elettra Sincrotrone Trieste and CNR-IOM)Poster
The extension of the FERMI free-electron laser toward shorter wavelengths (FERMI 2.0) challenges the performance of the Photon Analysis Delivery and Reduction System (PADReS), originally optimized for operation above a few nanometers.
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At λ < 5 nm, photon transport efficiency and diagnostic capability are limited by reduced mirror reflectivity, gas transparency in intensity monitors, and the... -
Julian Max SalcheggerPoster
Transition-metal dichalcogenides exhibit a range of exploitable properties, including the chiral magnetic effect, orbital Hall effect (OHE), type-II Dirac cones that break the Lorentz invariance, and topologically non-trivial surface states. Understanding the nature of the charge carriers and the electronic structure of the Dirac semimetal $\text{PtSe}_2$, which offers both air-stability and...
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Fatih Žgalj (University of Sarajevo), Damir Agacevic (University of Sarajevo), Dr Abdulah Jašarević (Faculty of Science, University of Sarajevo)Poster
We investigate strong-field processes in noble-gas atoms driven by intense laser fields in the presence of an additional terahertz (THz) field. Particular emphasis is placed on above-threshold ionization (HATI), where the combined fields enable control over electron trajectories and final momentum distributions. By tuning the relative delay and strength of the THz field, we demonstrate...
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Sebastião Antunes (CFEL, DESY; IFJ)Poster
The principle behind light-induced switching, which is used in modern electronic devices, is the modulation of a light signal in an externally modified medium. This allows for real-time control of the signal's phase, amplitude, or polarization. In this study, we theoretically examine transient changes in the optical polarization of wide-bandgap semiconductors irradiated by femtosecond XUV...
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Zeinab Ebrahimpour (FERMI FELs, Elettra-Sincrotrone Trieste, Basovizza Area Science Park, 34149 Trieste, Italy)Poster
Silicon undergoes a sub-picosecond non-thermal melting transition when excited by intense femtosecond laser pulses. This talk demonstrates how soft X-ray absorption spectroscopy (XAS), performed at the seeded FERMI free-electron laser (FEL), effectively captures this process by resolving the ultrafast electronic structure dynamics of silicon with a temporal resolution on the 10 fs...
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Alberto Simoncig (Elettra Sincrotrone Trieste)Poster
The ultrafast X-ray science community is looking for new spectroscopical layouts capable of disclosing how out of equilibrium states of matter rise and relax, as proof of principle schemes to achieve new insight on the mechanisms responsible for driving novel phases of matter.
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Specifically, the advent of free-electron lasers (FELs) paves the way to the implementation of XUV-XUV time-resolved...
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