A5033543980- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- X-ray Spectroscopy and Fluorescence Analysis
- Optical Systems and Laser Technology
- Advanced Electron Microscopy Techniques and Applications
- Adaptive optics and wavefront sensing
- Laser-Matter Interactions and Applications
- Advancements in Photolithography Techniques
- Mass Spectrometry Techniques and Applications
- Advanced X-ray and CT Imaging
- Particle accelerators and beam dynamics
- Spectroscopy and Quantum Chemical Studies
- Crystallography and Radiation Phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Ocular and Laser Science Research
- Diamond and Carbon-based Materials Research
- Magneto-Optical Properties and Applications
- Advanced Fluorescence Microscopy Techniques
- Laser-induced spectroscopy and plasma
- Astrophysical Phenomena and Observations
- Advanced Optical Sensing Technologies
Deutsches Elektronen-Synchrotron DESY
2019-2023
Swiss Federal Laboratories for Materials Science and Technology
2015-2021
In this work, single-shot ptychography was adapted to the XUV range and, as a proof of concept, performed at free-electron laser FLASH DESY obtain high-resolution reconstruction test sample. Ptychography is coherent diffraction imaging technique capable extended samples with diffraction-limited resolution. However, its scanning nature makes time-consuming and also prevents application for mapping dynamical processes. Single-shot can be realized by collecting patterns multiple overlapping...
Ptychography, a scanning coherent diffraction imaging method, can produce high-resolution reconstruction of sample and, at the same time, illuminating beam. The emergence vacuum ultraviolet and X-ray free electron lasers (FELs) has brought sources with unprecedented characteristics that enable ptychography highly intense ultra-fast short-wavelength pulses. However, shot-to-shot pulse fluctuations typical for FEL pulses particularly partial spatial coherence self-amplified spontaneous...
Direct metrology of coherent short-wavelength beamlines is important for obtaining operational beam characteristics at the experimental site. However, since beam-time limitation imposes fast procedures, a multi-parametric from as low single shot desirable. Here two-dimensional (2D) procedure based on high-resolution Fresnel diffraction analysis discussed and applied, which allowed an efficient detailed beamline characterization SACLA XFEL. So far, potential has not been fully exploited...
Abstract We have conceived and built the HILITE (High-Intensity Laser-Ion Trap Experiment) Penning-trap setup for production, confinement preparation of pure ensembles highly charged ions in a defined quantum state as target various high-intensity lasers. This enables broad suite laser-ion interaction studies at high photon energies and/or intensities, such non-linear photo-ionisation studies. The has now been used to perform experiments one laser facility, namely FLASH Free-Electron Laser...
Methods of ablation imprints in solid targets are widely used to characterize focused X-ray laser beams due a remarkable dynamic range and resolving power. A detailed description intense beam profiles is especially important high-energy-density physics aiming at nonlinear phenomena. Complex interaction experiments require an enormous number be created under all desired conditions making the analysis demanding requiring huge amount human work. Here, for first time, we present imprinting...
We present a novel, to the best of our knowledge, Hartmann wave front sensor for extreme ultraviolet (EUV) spectral range with numerical aperture (NA) 0.15. The has been calibrated using an EUV radiation source based on gas high harmonic generation. calibration, together simulation results, shows accuracy beyond λ/39 root mean square (rms) at λ=32nm. is suitable measurement in 10 nm 45 regime. This compact high-vacuum compatible and designed situ operations, allowing wide applications...
Abstract We measured the transverse coherence at FLASH2, a variable gap undulator line FLASH free-electron laser user facility DESY in Hamburg. demonstrate, theoretically and experimentally, revised version of Young’s double pinhole approach to perform single-shot, repeatable non-invasive measurements. At beamline FL24 pulses was systematically characterized wavelengths 8, 13.5 18 nm for different FEL source settings. determine degrees 57% 87% vertical horizontal direction, respectively....
The PERCIVAL detector is a CMOS imager designed for the soft X-ray regime at photon sources. Although still in its final development phase, it has recently seen first user experiments: ptychography free-electron laser, holographic imaging storage ring and preliminary tests on correlation spectroscopy. performed remarkably well terms of spatial resolution achievable sample plane, owing to small pixel size, large active area very dynamic range; but also frame rate, which significantly faster...
Wavefront-propagation simulations have been performed to complete the design of a monochromator beamline for FLASH2, variable-gap undulator line at soft X-ray free-electron laser in Hamburg (FLASH). Prior propagation through optical elements, parameters photon source were generated using GENESIS code which includes experimental data. Threshold tolerances misalignment mirror angles are calculated and, since diffraction effects included simulations, minimum quality with respect slope errors...
Extreme ultraviolet (EUV) photon beam characterization techniques, Hartmann wavefront sensing and single shot ablation imprinting, were compared along the caustic of a tightly focused free-electron laser (FEL) at beamline FL24 FLASH2, Free-electron LASer in Hamburg DESY. The transverse coherence EUV FEL was determined by Young's double pinhole experiment used back-propagation algorithm which includes partial to calculate intensity profiles from measurements. A very good agreement profile...
FLASH, the soft X-ray Free Electron Laser in Hamburg provides pulses with high brilliance, short pulse duration and repetition rate for user experiments. Photon beam parameters can be chosen almost independently FLASH1 FLASH2 by users. The experimental hall Kai Siegbahn is designed to offer up 6 new beamlines. Currently, three beamlines are operation, which provide advanced focusing systems extensive photon diagnostics variable micro-focus beamline FL24 at offers a Kirkpatrick Baez optical...
Abstract Ptychograhy is a scanning coherent diffraction imaging technique capable of providing images extended samples with diffraction-limited resolution. However, ptychography experiments are time-consuming due to their nature which also prevents use for dynamical processes. Recently, setups based on two con-focal lenses were proposed perform single-shot in the visible regime by measuring pattern produced multiple overlapping beams one shot. this approach cannot be straightforwardly X-ray...
Polyethylene terephthalate (PET) is a thermoplastic polyester with numerous applications in industry. However, it requires surface modification on an industrial scale for printing and coating processes plasma treatment one of the most commonly used techniques to increase hydrophilicity PET films. Systematic improvement by adaption process can be aided comprehensive understanding morphology chemistry. imaging large areas (tens microns) resolution that allows quality challenging. As...
Several applications in material science and magnetic holography using extreme ultraviolet (EUV) radiation require the measurement of degree state polarization. In this work, an instrument to measure simultaneously both parameters from EUV pulses is presented. The determines Stokes after a reflection on array multilayer mirrors at Brewster angle. Stokesmeter was tested Swiss Light Source different wavelengths. experimental patterns source were compared with simulated pattern.
Lensless imaging requires coherent illumination, which is typically available at beamlines. A study of lensless with a table-top X-ray laser presented, comparing two alternative data-processing techniques, i.e. using the near and far field data. In order to have consistent comparison, Fresnel zone plate was studied as object, because its modulated structure permits obtain both (near field) Fraunhofer (far pattern simultaneously. Results show factor 3 difference in resolution, major...
A proper spatial characterization of a laser beam profile is indisputably important for any laser-mater experiment as well protection beamline optical elements. Method ablation and desorption imprints provides thorough analysis applicable to broad range photon energies. This method, however, often requires up thousands shots which must be then manually analyzed. Here we present method based on deep learning image segmentation model able substitute human element currently indispensable in...
An accurate transmission measurement of thin foils (usually made elemental metals and/or semiconductors), which routinely are used as attenuators in soft x-ray beamlines, end-stations and instruments, represents a long standing problem over the wide experimentation field with photon beams, see for example [1-4]. Such also frequently utilized blocking wavelength emission, i.e., UV-Vis-IR radiation, from plasma high order harmonic sources, whilst x-rays emitted source pass through foil only...
The free-electron laser FLASH2, a variable gap undulators line, has opened new scientific possibilities for users at DESY in the Hamburg area [1]. current pulsed radiation FLASH facility primarily relies on SASE process. Thus, beam characteristics may differ drastically from pulse to pulse; requiring single-shot photon diagnostics and characterization of parameters. beamline FL24 FLASH2 is equipped with set bendable Kirkpatrick-Baez (KB) mirrors which can strongly focus down few micrometers....
The dependency on the excitation energy of ultrafast multi-photon ionization xenon by intense, short extreme ultraviolet pulses (XUV) was investigated in vicinity 4$d$ 'giant' resonance using ion time-of-flight spectroscopy. yields high charge states show strong variations with energy. With reference to simulated absorption spectra, we can link photon structures single-electron excitations mainly N-shell and purely sequential absorption.