A5001266746- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Photonic Crystal and Fiber Optics
- Photorefractive and Nonlinear Optics
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Advanced X-ray Imaging Techniques
- Atomic and Molecular Physics
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Ion-surface interactions and analysis
- Optical Systems and Laser Technology
- Mass Spectrometry Techniques and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Pulsed Power Technology Applications
- Welding Techniques and Residual Stresses
- High-pressure geophysics and materials
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Quantum, superfluid, helium dynamics
Extreme Light Infrastructure Beamlines
2015-2025
Czech Academy of Sciences, Institute of Physics
2014-2023
Uppsala University
2021
Center for Biomolecular Nanotechnologies
2020
Czech Technical University in Prague
2020
Vilnius University
2007-2014
We show the laser-driven acceleration of unprecedented, collimated (2 mrad divergence), and quasi-monoenergetic (25% energy spread) electron beams with up to 50 MeV at 1 kHz repetition rate. The laser driver is a multi-cycle (15 fs) optical parametric chirped pulse amplification system, operating 26 mJ (1.7 TW). scalability technology reported in this work pave way toward developing high-brilliance x-ray sources for medical imaging innovative devices brain cancer treatment represent step...
We report on a broadband OPCPA system, pumped at 515 nm by frequency doubled Yb:YAG thin disk lasers. The system delivers 11.3 mJ pulses central wavelength of 800 with spatial beam quality M2 = 1.25 and > 25% pump-to-signal conversion efficiency. were demonstrated to be compressible 12 fs using chirped mirror compressor.
Abstract Ultrafast electron dynamics drive phenomena such as photochemical reactions, catalysis, and light harvesting. To capture in real-time, femtosecond to attosecond sources are extensively used. However, an exact match between the excitation photon energy a characteristic resonance is crucial. High-harmonic generation advantageous terms of pulse duration but limited spectral tunability vacuum ultraviolet range. Here, we present monochromatic source continuously tunable around 21 eV...
We report on a frequency-doubled picosecond Yb:YAG thin disk regenerative amplifier, developed as pump laser for kilohertz repetition rate OPCPA. At of 1 kHz, the compressed output amplifier has pulse duration 1.2 ps and energy 90 mJ with stability σ < 0.8% M2 1.2. The pulses are frequency doubled in an LBO crystal yielding 42 at 515 nm.
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 can be driven either by an in-house developed high-contrast sub-20 fs near-infrared terawatt laser based on optical parametric chirped-pulse amplification technology or more conventional Ti:sapphire delivering 12 mJ and 45 pulses. parameters obtained with two driving lasers compared. A photon flux order up to...
We present a stable supercontinuum (SC) generated in bulk YAG crystal, pumped by 3 ps chirped pulses at 1030 nm. The SC is loose focus geometry 13 cm long allowing for and robust single-filament generation. energy stability exceeds that of the pump laser almost factor 3. Additionally, we show spectrum has long-term coherent compressible compressing portions spectra close to corresponding Fourier limit. This makes picosecond-pulse-driven suitable seed OPCPA amplifiers.
We present a broadband optical parametric chirped pulse amplification (OPCPA) system delivering 4 J pulses at repetition rate of 5 Hz. It will serve as frontend for the 1.5 kJ, <150 fs, 10 PW laser beamline currently under development by consortium National Energetics and Ekspla. The spectrum OPCPA is precisely controlled arbitrarily generated waveforms pump lasers. To fully exploit high flexibility frontend, we have developed 1D model an optimization algorithm that predicts suitable...
A simple and compact scheme for synchronization of the pump signal pulses short-pulse OPCPA is demonstrated. Relative timing jitter 17 fs RMS achieved (1% pulse duration) system remains locked hours. The uses a balanced optical cross correlator to detect relative delays between can be operated with just 10's μJ energy pJ-level energies.
Overview of the laser systems being built for ELI-Beamlines is presented. The facility will make available high-brightness multi-TW ultrashort pulses at kHz repetition rate, PW 10 Hz rate pulses, and kilojoule nanosecond generation peak power. lasers extensively employ emerging technology diode-pumped solid-state (DPSSL) to pump OPCPA Ti:sapphire broadband amplifiers. These provide user community with cutting-edge resources programmatic research in applications high-intensity X-ray sources,...
In this paper the results of theoretical and experimental study spatiotemporal distortions emerging in noncollinear optical parametric chirped-pulse amplifiers are presented. a amplifier, when pulse fronts pump signal not matched, becomes tilted and, aside from angular dispersion, has spatial chirp. The expressions relating magnitudes acquired chirp dispersion to temporal derived. It is shown that induced decrease at different rates with increase for large chirp, mainly contributes...
Vacuum chambers are frequently used in high-energy, high-peak-power laser systems to prevent deleterious nonlinear effects, which can result from propagation air. In the vacuum sections of Allegra system at ELI-Beamlines, we observed degradation several optical elements due laser-induced contamination (LIC). This is present on surfaces with intensity above <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mn>30</mml:mn> <mml:mspace width="thickmathspace"/>...
White light continuum seeded noncollinear optical parametric amplifier driven by Yb:KGW master oscillator power (MOPA) system is reported. The demonstrated design provides amplification of broadband pulses at 800 nm up to 20 µJ energy 1 kHz repetition rate and can be used as simple reliable frontend source for systems producing high intensity few-cycle pulses. amplified spectral bandwidth allows <7 fs pulse durations preliminary compression partial spectrum yields sub-10 pulse.
Abstract We present the results of performance modeling a diode-pumped solid-state HiLASE laser designed for use in inertial fusion energy power plants. The main amplifier concept is based on He-gas-cooled multi-slab architecture similar to that employed Mercury system. Our quantifies reduction thermally induced phase aberrations and average depolarization ${\mathrm{Yb}}^{{3+}}$ :YAG slabs by combination helium cryogenic cooling properly (doping/width) cladding materials.
Overview of progress in construction and testing the laser systems ELI-Beamlines, accomplished since 2015, is presented. Good has been achieved all four lasers based largely on technology diode-pumped solid state (DPSSL). The first part L1 laser, designed to provide 200 mJ <15 fs pulses at 1 kHz repetition rate, up running. L2 a development line employing 10 J / Hz cryogenic gas-cooled pump which recently equipped with an advanced engine. Operation L3-HAPLS system, using DPSSL Ti:sapphire...
A robust and simple method is presented for ensuring constant energy pointing of a high average power solid state laser on target. In addition to providing long-term stability, this scheme also eliminates any drifts in or resulting from the initial warm-up after cold start. This achieved using two separate feedback loops: one loop stabilizes beam external amplifier cavity other locks mode have optimum overlap with pump spot active medium. The key idea stabilization monitor gain medium camera...
We present a compact TW-class OPCPA system operating at 800 nm. Broadband seed pulses are generated and pre-amplified to 25 μJ in white light continuum seeded femtosecond NOPA. Amplification of the 35 mJ repetition rate 10 Hz compression 9 fs is demonstrated.
We report on a 1 kHz, 515 nm laser system, based commercially available 230 W average power Yb:YAG thin-disk regenerative amplifier, developed for pumping one of the last optical parametric chirped pulse amplification (OPCPA) stages Allegra system at ELI Beamlines. To avoid problems with self-focusing picosecond pulses, 1030 output pulses are compressed and frequency doubled an LBO crystal in vacuum. Additionally, development thermal management was needed to ensure stable phase matching...
We show the laser-driven acceleration of unprecedented, collimated (2 mrad) and quasi-monoenergetic (dE/E = 25%) electron beams with energy up to 50 MeV at 1 kHz repetition rate. The laser driver is a multi-cycle (15 fs) OPCPA system, operating 26 mJ (1.7 TW). scalability technology reported in this work pave way towards developing high brilliance X-ray sources for medical imaging, innovative devices brain cancer treatment represent step forward realization GeV beamline.
We investigated thermal-lensing effects in a diode end-pumped Yb:KGW laser with slab shaped active element.Performance and thermal lensing properties for Ng cut athermal propagation direction are presented.It is found that crystal along provides weaker lens than element, however, due to anisotropic characteristics, highly astigmatic.End bulging contribution under intense pump was measured (for element).
We report on the design and performance of a fiber-based, multi-channel laser amplifier seed pulse distribution system. The device is designed to condition distribute low energy pulses from mode-locked oscillator multiple, highly synchronized, high amplifiers integrated into beamline. Critical functions such as temporal stretching well beyond 100 ps/nm, picking, fine control over delay up 300 ps are all performed in fiber eliminating need for bulky expensive grating stretchers, Pockels...
In this paper, the authors present characterization experiments of a 20 fs vacuum ultraviolet beam from high harmonic generation source. The hits silicon sample and passes triple reflection gold polarizer located inside an ultrahigh chamber. polarizer’s Malus curve was obtained; total acquisition time for each point 30 s. This aims to be first time-resolved user station dedicated ellipsometry. is generated by 12 mJ, 1 kHz, fs, in-house-developed laser detected back-illuminated charge-coupled device.
We present a high-energy picosecond Nd:YAG-amplification system seeded with pulses of femtosecond Yb:KGW oscillator. The Nd : YAG amplifier is intended to pump an optical parametric chirped-pulse amplification (OPCPA) system. Generation high contrast energy 600 mJ and pulse duration 100 ps demonstrated.
Direct carrier-envelope phase stabilization of an Yb:KGW MOPA laser system is demonstrated with a residual jitter reduced to below 100 mrad, which compares favorably previous reports, both amplified systems as well ytterbium-based oscillators. This novel scheme relies on frequency synthesis and feed-forward approach. The direct sub-MHz comb from CPA amplifier not only reduces the noise but also greatly simplifies setup.
We report on the current state of readiness 1 kHz, 15 fs L1 ALLEGRA laser system for long term reliable operation driving user experiments based HHG. The highly automated system, short pulse OPCPA, currently generates pulses with energy 30 mJ at central wavelength 820 nm.
We report on the method for picosecond pulse envelope shaping that is based temporal profile transformations during cascade second harmonic generation. It was demonstrated theoretically and experimentally under a particular generation condition, e. g. pump intensity crystal length, 1064 nm pulses with close to Gaussian one width of 75 ps at FWHM can be converted fundamental harmonics super-Gaussian having an plateau region extending over ~100 time interval when conversion efficiency in first...