J. Nejdl
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View article: Toward controlling electron beam charge with nanoparticle-assisted laser wakefield accelerators
Toward controlling electron beam charge with nanoparticle-assisted laser wakefield accelerators Open
This study explores nanoparticle-assisted electron injection as a method for controlling beam charge in laser wakefield acceleration through particle-in-cell simulations. We systematically investigate how the material (Li through Au) and s…
View article: THz emission from multiple ionized plasma
THz emission from multiple ionized plasma Open
Studies employing nonlinear interactions of THz pulses are nowadays a promising scientific research field. To capture these phenomena, THz pulses with energy ranging from hundreds of \muJ to the mJ level are necessary. However, techniques …
View article: High-harmonic spectroscopy of the nonadiabatic coupling via Floquet-Bloch states
High-harmonic spectroscopy of the nonadiabatic coupling via Floquet-Bloch states Open
Strong laser light drives complex quantum electron dynamics in solids, which is captured by the high-harmonic generation (HHG) process. Here we report the observation of laser-dressed Floquet-Bloch states (FBSs) at the edge of the Brilloui…
View article: Compact laser-driven plasma X-ray source for time-resolved diffraction, spectroscopy and imaging experiments at ELI Beamlines
Compact laser-driven plasma X-ray source for time-resolved diffraction, spectroscopy and imaging experiments at ELI Beamlines Open
In this work, experimentally measured characteristics of a kilohertz laser-driven Cu plasma X-ray source that was recently commissioned at the ELI Beamlines facility are reported. The source can be driven either by an in-house developed hi…
View article: Demonstration of The Brightest Nano-size Gamma Source
Demonstration of The Brightest Nano-size Gamma Source Open
Gamma rays selectively interact with nuclei, induce and mediate nuclear reactions and elementary particle interactions, and exceed x-rays in penetrating power and thus are indispensable for analysis and modification of dense objects. Yet, …
View article: Compact laser-driven plasma X-ray source for time-resolved diffraction, spectroscopy, and imaging experiments at ELI Beamlines
Compact laser-driven plasma X-ray source for time-resolved diffraction, spectroscopy, and imaging experiments at ELI Beamlines Open
Experimentally measured characteristics of a kHz laser-driven Cu plasma X-ray source that was recently commissioned at ELI Beamlines facility are reported. The source can be driven either by an in-house developed high contrast sub-20 fs ne…
View article: Sampling requirements in near-field ptychography
Sampling requirements in near-field ptychography Open
Ptychography is a robust lensless form of microscopy routinely used for applications spanning life and physical sciences. The most common ptychography setup consists in using a detector to record diffraction patterns in the far-field. A ne…
View article: Correction: Chaulagain et al. ELI Gammatron Beamline: A Dawn of Ultrafast Hard X-ray Science. Photonics 2022, 9, 853
Correction: Chaulagain et al. ELI Gammatron Beamline: A Dawn of Ultrafast Hard X-ray Science. Photonics 2022, 9, 853 Open
We noticed that Figure 1 in the original publication [...]
View article: Monochromatic high-order harmonic generation by a Bessel-Gauss beam in periodically modulated media
Monochromatic high-order harmonic generation by a Bessel-Gauss beam in periodically modulated media Open
High harmonic generation (HHG) has become a multipurpose source of coherent\nXUV radiation used in various applications. One of the notable aspects of HHG\nis its wide spectrum consisting of many harmonic orders. This might represent a\nbo…
View article: Bright coherent attosecond X-ray pulses from beam-driven relativistic mirrors
Bright coherent attosecond X-ray pulses from beam-driven relativistic mirrors Open
Bright ultrashort X-ray pulses allow scientists to observe ultrafast motion of atoms and molecules. Coherent light sources, such as the X-ray free electron laser (XFEL), enable remarkable discoveries in cell biology, protein crystallograph…
View article: Metrology for sub-Rayleigh-length target positioning in ∼10<sup>22</sup> W/cm<sup>2</sup> laser–plasma experiments
Metrology for sub-Rayleigh-length target positioning in ∼10<sup>22</sup> W/cm<sup>2</sup> laser–plasma experiments Open
Tight focusing with very small f -numbers is necessary to achieve the highest at-focus irradiances. However, tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance. We descr…
View article: Multiscale modelling of HHG and its applications for phase-matching optimisation
Multiscale modelling of HHG and its applications for phase-matching optimisation Open
International audience
View article: Diagnostics for precise target positioning in ~10^22 W/cm2 laser-plasma experiments
Diagnostics for precise target positioning in ~10^22 W/cm2 laser-plasma experiments Open
Tight focusing with very small f-numbers is necessary to achieve highest at-focus irradiances. However, tight focusing also means short Rayleigh length, which imposes strong demands on the precise positioning of the target at the best focu…
View article: Multiscale modeling of HHG and its applications
Multiscale modeling of HHG and its applications Open
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic
View article: Single-shot spatial coherence of a plasma based soft X-ray laser
Single-shot spatial coherence of a plasma based soft X-ray laser Open
Many applications of short-wavelength radiation impose strong requirements on the coherence properties of the source. However, the measurement of such properties poses a challenge, mainly due to the lack of high-quality optics and source f…
View article: Long-lasting XUV activation of helium nanodroplets for avalanche ionization
Long-lasting XUV activation of helium nanodroplets for avalanche ionization Open
We study the dynamics of avalanche ionization of pure helium nanodroplets activated by a weak extreme-ultraviolet (XUV) pulse and driven by an intense near-infrared (NIR) pulse. In addition to a transient enhancement of ignition of a nanop…
View article: Anomalous Relativistic Emission from Self-Modulated Plasma Mirrors
Anomalous Relativistic Emission from Self-Modulated Plasma Mirrors Open
The interaction of intense laser pulses with plasma mirrors has demonstrated the ability to generate high-order harmonics, producing a bright source of extreme ultraviolet (XUV) radiation and attosecond pulses. Here, we report an unexpecte…
View article: Bright continuously-tunable VUV source for ultrafast spectroscopy
Bright continuously-tunable VUV source for ultrafast spectroscopy Open
Ultrafast electron dynamics drive phenomena such as photochemical reactions, catalysis, and light harvesting. To capture such dynamics in real-time, femtosecond to attosecond light sources are extensively used. However, an exact match betw…
View article: Electron correlation dynamics in atomic Kr excited by XUV pulses and controlled by NIR laser pulses of variable intensity
Electron correlation dynamics in atomic Kr excited by XUV pulses and controlled by NIR laser pulses of variable intensity Open
We have investigated the possibility to track and control correlation dynamics of valence electrons in krypton (Kr) initiated by the absorption of one extreme ultraviolet (XUV) photon. In this investigation, pump-probe experiments have bee…
View article: ELI Gammatron Beamline: A Dawn of Ultrafast Hard X-ray Science
ELI Gammatron Beamline: A Dawn of Ultrafast Hard X-ray Science Open
The realization of compact X-ray sources is one of the most intriguing applications of laser-plasma based electron acceleration. These sources based on the oscillation of short micron-sized bunches of relativistic electrons provide femtose…
View article: Absorption-limited XUV generation in noble gases
Absorption-limited XUV generation in noble gases Open
International audience
View article: Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser
Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser Open
Radiative shocks (RS) are complex phenomena which are ubiquitous in astrophysical environments. The study of such hypersonic shocks in the laboratory, under controlled conditions, is of primary interest to understand the physics at play an…
View article: Large area ion beam sputtered dielectric ultrafast mirrors for petawatt laser beamlines
Large area ion beam sputtered dielectric ultrafast mirrors for petawatt laser beamlines Open
The latest advances in petawatt laser technology within the ELI Beamlines project have stimulated the development of large surface area dielectrically coated mirrors meeting all demanding requirements for guiding the compressed 30 J, 25 fs…
View article: Phase-matched absorption-limited HHG using pre-ionization
Phase-matched absorption-limited HHG using pre-ionization Open
We have discovered that ionization-induced defocusing is the main cause of inefficient high-order harmonic generation in long absorption-limited media. A novel method utilizing pre-ionization to overcome this bottleneck was validated both …
View article: Multi-Lane Mirror for Broadband Applications of the Betatron X-ray Source
Multi-Lane Mirror for Broadband Applications of the Betatron X-ray Source Open
A new generation of small-scale ultrafast X-ray sources is rapidly emerging. Laser-driven betatron radiation represents an important class of such ultrafast X-ray sources. With the sources driving towards maturity, many important applicati…
View article: Two-color nonlinear resonances in betatron oscillations of laser accelerated relativistic electrons
Two-color nonlinear resonances in betatron oscillations of laser accelerated relativistic electrons Open
X-ray radiation from laser wakefield accelerated (LWFA) electrons provides a collimated broadband femtosecond x-ray source with micron-scale source size. However, the photon flux is still inadequate for a range of applications. By interact…