A5066196040- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Advanced X-ray Imaging Techniques
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Laser-induced spectroscopy and plasma
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Laser Design and Applications
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Solid State Laser Technologies
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Digital Holography and Microscopy
- Electron and X-Ray Spectroscopy Techniques
- Laser Material Processing Techniques
- Ion-surface interactions and analysis
- Spectroscopy and Laser Applications
- Magnetic confinement fusion research
- GaN-based semiconductor devices and materials
- Medical Imaging Techniques and Applications
- Photonic Crystals and Applications
Schneider Electric (Spain)
2025
Instituto Superior Técnico
2014-2024
University of Lisbon
2010-2024
Instituto Politécnico de Lisboa
2001-2024
Portland State University
2024
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2010-2022
Centre National de la Recherche Scientifique
1999-2021
Université de Limoges
2021
XLIM
2021
Lebanese American University
2021
The following topics are dealt with: TTF/FLASH in the XFEL context, general layout of facility, accelerator, undulators for SAES and spontaneous emission, photon beamlines scientific instruments, infrastructure auxiliary systems, commissioning operation, project management organization, cost time schedule. (HSI)
Coherent x-ray diffractive imaging is a powerful method for studies on nonperiodic structures the nanoscale. Access to femtosecond dynamics in major physical, chemical, and biological processes requires single-shot diffraction data. Up now, this has been limited intense coherent pulses from free electron laser. Here we show that laser-driven ultrashort sources offer comparatively inexpensive alternative. We present measurements of patterns isolated nano-objects with single 20 fs pulse...
Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and photon energy. One of the remaining shortages this source is its restriction linear polarization, since yield elliptically polarized high harmonics has been low so far. We here show how limitation overcome by using a cross-polarized two-colour laser field. With simple technique, we reach degrees ellipticity (up 75%) efficiencies similar classically generated linearly...
The efficiency and uniformity of heating induced by hard x-ray free-electron laser pulse is investigated for 0.5 μm silver foils using the X-ray Pump Probe instrument at Linac Coherent Light Source facility. Intense 8.9 keV pulses 60 fs duration deposit energy predominantly via inner-shell ionization to create a non-equilibrium Ag solid density plasma. are focused 14 × 17 μm2 means beryllium lenses varying total beam energy, deposition varied over range irradiances from 4.4 6.5 1015 W/cm2....
Abstract Chirped pulse amplification in optical lasers is a revolutionary technique, which allows the generation of extremely powerful femtosecond pulses infrared and visible spectral ranges. Such are nowadays an indispensable tool for myriad applications, both fundamental applied research. In recent years, strong need emerged light sources producing ultra-short intense laser-like X-ray pulses, to be used experiments variety disciplines, ranging from physics chemistry biology material...
The emergence of energy communities (ECs) as new stakeholders in modern electrical grids presents an opportunity to address the challenges associated with integrating distributed resources, such increased uncertainty and variability generation, transmission grid saturation, or diminished power quality, among others. ability EC provide flexibility is therefore paramount. However, data privacy investment costs are main drawbacks achieving optimal operation. This paper proposes a optimization...
Incoherent Diffraction Imaging - IDI is a diffraction-based imaging technique that has been recently proposed to exploit the partial coherence of incoherently scattered light retrieve structural information from scattering centers. Similar stellar intensity interferometry Hanbury Brown and Twiss, signal builds up on second-order spatial correlations emitted light. The complex distribution target thereby encoded in fluctuations first experimental realisations this have realised using...
In atoms undergoing ionisation, an abrupt re-arrangement of free and bound electrons can lead to the ejection another electron (shake-off). The spectroscopic signatures shake-off have been predicted observed in solids. Here, we present first observation this process a solid-density plasma heated by x-ray laser. results show that L-shell persists up temperatures 10 eV at solid density, follow probability for This work shows should be included models correct interpretation emission spectra.
Non-thermal photo-ionized plasmas are now established in the laboratory, and require models that treat atomic processes electron distribution self-consistently. We investigate effects of inelastic thermalization iron under intense X-ray irradiation using model BigBarT, suited for self-consistent evolution continuum, including degeneracy effects. Our study focuses particularly on collisional $M$-shell ionization, which we identify as dominant relaxation process non-thermal electrons. show...
Structured light and high-intensity ultrafast lasers are two rapidly advancing frontiers in photonics, yet their intersection remains largely unexplored. While continue to push the boundaries of peak intensities, structured has enabled unprecedented control over light's spatial, temporal, polarization properties. However, lack robust optical devices capable bridging with domain constrained progress combining these directions. Here, we demonstrate high-aspect-ratio silica meta-optics, which...
Soft-x-ray digital in-line microscopic holography is achieved using a fully coherent high-order harmonic source emitting at 32nm. Combination of commercial-grade soft-x-ray optics and back-illuminated CCD detector allows compact versatile holographic setup. Different experimental geometries have been tested by imaging calibrated 50nm tips 1μm wires. Spatial resolution 800nm measured with magnifications ranging from 30 to 110 numerical aperture around 0.01. Finally, the potentiality...
Free-electron lasers (FEL) and plasma-based soft x-ray (PSXL) have been recently evolving very fast from the vacuum ultraviolet to region. Once seeded with high harmonics, these schemes are considered as next generation light sources delivering ultrashort pulses temporal spatial coherence. Here, we present a detailed experimental study of kHz two-colour harmonic performed in various gases investigate its potential suitable evolution actual seeding sources. It turns out that this double...
We have focused a beam (BL3) of FLASH (Free-electron LASer in Hamburg: λ = 13.5 nm, pulse length 15 fs, energy 10-40 μJ, 5Hz) using fine polished off-axis parabola having focal 270 mm and coated with Mo/Si multilayer an initial reflectivity 67% at nm.The OAP was mounted aligned picomotor controlled sixaxis gimbal.Beam imprints on poly(methyl methacrylate) -PMMA were used to measure focus the create isochoric heating various slab targets.Results show spot has diameter 1μm.Observations...
The amplification of high-order harmonics (HOH) in a plasma-based amplifier is multiscale, temporal phenomenon that couples plasma hydrodynamics, atomic processes, and HOH electromagnetic fields. We use one-dimensional, time-dependent Maxwell-Bloch code to compare the natural regime another where polarization constantly forced by HOH. In this regime, 10-MW (i.e., 100 times higher than current seeded soft x-ray laser power), 1.5-$\ensuremath{\mu}$J, 140-fs pulse free from parasitic structures...
We present what is to our knowledge the first longitudinal coherence measurement of a transient inversion collisional x-ray laser. investigated picosecond output Ni-like Pd laser at 14.68 nm generated by COMET facility Lawrence Livermore National Laboratory. Interference fringes were with Michelson interferometer setup in which thin multilayer membrane was used as beam splitter. determined for 4dS01→4pP11 lasing transition be ~400μm (1/e half-width) changing length one arm and measuring...