A5042805072- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Photorefractive and Nonlinear Optics
- Advanced X-ray Imaging Techniques
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Spectroscopy and Laser Applications
- Luminescence Properties of Advanced Materials
- Semiconductor Lasers and Optical Devices
- Optical Systems and Laser Technology
- Advanced Surface Polishing Techniques
- Surface Treatment and Residual Stress
- Ocular and Laser Science Research
- Glass properties and applications
- Optical properties and cooling technologies in crystalline materials
- Magneto-Optical Properties and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Adhesion, Friction, and Surface Interactions
Czech Academy of Sciences, Institute of Physics
2016-2025
Czech Academy of Sciences
2008-2024
Helmholtz Institute Jena
2021
Institute of Physics
2015-2019
Rutherford Appleton Laboratory
2018
Heriot-Watt University
2017
Czech Academy of Sciences, Nuclear Physics Institute
2016
Czech Academy of Sciences, Institute of Plasma Physics
2001-2014
University of Messina
2012
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2012
Highly regular laser-induced periodic surface structures (HR-LIPSS) have been fabricated on surfaces of Mo, steel alloy and Ti at a record processing speed large areas with regularity in the obtained sub-wavelength structures. The physical mechanisms governing LIPSS are identified linked decay length (i.e. mean free path) excited electromagnetic waves (SEWs). dispersion orientation angle well correlates SEWs length: shorter this length, more LIPSS. A material dependent criterion for...
We report efficient and stable operation of the first multi-joule diode pumped solid state laser delivering 1 kW average power in 105 J, 10 ns pulses at Hz, confirming scalability multi-slab cryogenic gas-cooled amplifier technology.
The Prague Asterix Laser System (PALS) is a new international laboratory where research teams are invited to compete for the beam time. PALS Center runs an iodine photodissociation high-power laser system delivering up 1.2 kJ of energy in ∼400 ps pulses at wavelength 1.315 μm. Optional doubling and tripling frequency assured by large-diameter nonlinear crystals. ASTERIX IV [H. Baumhacker et al., Appl. Phys. B 61, 325 (1995)], transferred from Garching into hall Prague, was updated put...
Nanostructured thin plastic foils have been used to enhance the mechanism of laser-driven proton beam acceleration. In particular, presence a monolayer polystyrene nanospheres on target front side has drastically enhanced absorption incident 100 TW laser beam, leading consequent increase in maximum energy and charge. The cutoff increased by about 60% for optimal spheres' diameter 535 nm comparison planar foil. total number protons with energies higher than 1 MeV was approximately 5 times. To...
Abstract In this paper, we establish connections between the thresholds and mechanisms of damage white-light generation upon femtosecond laser irradiation wide-bandgap transparent materials. On example Corning Willow glass, evolution ablation craters, their quality, emission were studied experimentally for 130-fs, 800-nm pulses. The experimental results indicate co-existence several which can be separated in time. Suppression phase explosion mechanism was revealed at middle spots. At high...
We review the progress in investigation of Verdet constant new magneto-active materials for Faraday-effect-based devices used high-power laser systems. A practical methodology advanced characterization these is presented, providing a useful tool benchmarking materials. The experimental setup flexible and robust evaluating Faraday rotation angle induced material, from which calculated based on knowledge magnetic field material sample parameters. general model describing measured data as...
Abstract Nuclear fusion between protons and boron-11 nuclei has undergone a revival of interest thanks to the rapid progress in pulsed laser technology. Potential applications such reaction range from controlled nuclear radiobiology cancer therapy. A laser-driven approach consists interaction high-power, high-intensity pulses with H- B-rich targets. We report on an experiment exploiting proton-boron CN-BN targets obtain high-energy alpha particle beams (up 5 MeV) using very compact tabletop...
ABSTRACT In the present work, laser shock peening (LSP) was applied on critical areas of ball pins made 41CrS4 steel to extend their fatigue life. The treatment introduced compressive residual stresses up a depth 1 mm with maximum value −592 MPa pin surface. This led suppression fretting in conical section under lower stress amplitudes and overall life improvement by factor 2.4. After LSP, crack propagation speed slowed down 0.001 μm/cycle from 0.1 μm/cycle. At high amplitudes, location main...
We have achieved very efficient high-harmonic generation in a two-color laser field using long gas jet of He. With the optimization parameters and target conditions, strong harmonics were produced at 2(2n+1)th orders an orthogonally polarized field. The strongest harmonic 38th order (21.6nm) reached energy 0.6μJ with 6mm jet, giving conversion efficiency as high 2×10−4.
We report on the successful demonstration of a 100 J-level, diode pumped solid state laser based cryogenic gas cooled, multi-slab ceramic Yb:YAG amplifier technology. When operated at 175 K, system delivered pulse energy 107 J 1 Hz repetition rate and 10 ns duration, by 506 940 nm, corresponding to an optical-to-optical efficiency 21%. To best our knowledge, this represents highest obtained from nanosecond pulsed laser. This confirms scalability optical for experiments architecture.
A polarization-stepping method for measurement of the Faraday rotation in magneto-active materials has been modified evaluating Verdet constant as a function wavelength and temperature. It used comparison temperature dependent constant, dominant electronic transition wavelength, Curie-Weiss terbium gallium garnet (TGG) single crystals TGG ceramics samples. The room-temperature values varied from 36.6 to 44.2 rad/T.m at 1.064 μm 122.4 155.5 0.632 all samples under investigation. These results...
An overview of the latest developments kilowatt-level diode pumped solid state lasers for advanced applications at HiLASE Centre is presented. subcontracted and in-house-developed laser beamlines The aim development to build kW-class delivering picosecond pulses between 1- 100-kHz repetition rates high-energy nanosecond 10 Hz. are based on Yb:YAG thin-disk amplifiers chirped pulse amplification. current status beamlines’ performance reported. advantages zero-phonon line pulsed pumping...
A high-contrast high-intensity petawatt-class Ti:sapphire chirped-pulse amplification laser has been developed for research on high field science. saturable absorber and a low-gain optical parametric preamplifier in the front-end have improved temporal contrast system to ∼ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math>$2 \times 10^{12}$</tex-math></inline-formula> subnanosecond time scale at ∼70 TW power level. In addition...
Multi-watt continuous-wave (CW) operation of tetragonal rare-earth calcium aluminate Yb:CaLnAlO4(Ln=Gd,Y)) crystals in plano-plano microchip lasers was demonstrated with an almost quantum-defect-limited slope efficiency. Pumped at 978 nm by InGaAs laser diode, a 3.4 mm long 8 at. % Yb:CaGdAlO4 generated 7.79 W 1057-1065 efficiency η=84% (with respect to the absorbed pump power). An even higher η=91% achieved 2.5 3 Yb:CaYAlO4 laser, from which 5.06 were extracted 1048-1056 nm. Both produced...
Silicon is one of the most abundant materials which used in many areas modern research and technology. A variety those applications require surface nanopatterning with minimum structure defects. However, high-quality nanostructuring large silicon at industrially acceptable speed still a challenge. Here, we report rapid formation highly regular laser-induced periodic structures (HR-LIPSS) regime strong ablation by infrared femtosecond laser pulses sub-MHz repetition rate. Parameters...
We report on obtaining output energy of 146 J in 10 ns long pulses at Hz repetition rate from Bivoj, a multi-Joule multi-slab cryogenic gas-cooled diode pumped solid state laser, by overcoming its damage threshold bottleneck. This is 40% and power increase the laser system comparison to our previous publication most powerful high system.
We report on stable, long-term operation of a diode-pumped solid-state laser (DPSSL) amplifying 15 ns pulses at 1029.5 nm wavelength to 10 J energy 100 Hz pulse rate, corresponding 1 kW average power, with 25.4% optical-to-optical efficiency. The was operated this level for over 45 minutes (∼3 · 5 shots) in two separate runs rms stability 1%. also 7 J, 4 hours (1.44 6 1% and no need user intervention. To the best our knowledge, is first time that reliable amplification kW-class high...
The deeply saturated operation of a double-pass Ne-like zinc soft x-ray laser emitting at wavelength 21.2 mm is reported, along with results study and optimization its beam parameters coherence. active medium 3-cm-long plasma column produced by separately delivered prepulse main pulse duration \ensuremath{\sim}450 ps, supplied 1.315-\ensuremath{\mu}m laser. To generate reduced lateral density gradients, the \ensuremath{\sim}130-\ensuremath{\mu}m-wide focus, producing pump irradiance...
Multi-MeV beams of light ions have been produced using the 300 picosecond, kJ-class iodine laser, operating at Prague Asterix Laser System facility in Prague. Real-time ion diagnostics performed by use various time-of-flight (TOF) detectors: collectors (ICs) with and without absorber thin films, new prototypes single-crystal diamond silicon carbide detectors, an electrostatic mass spectrometer (IEA). In order to suppress long photopeak induced soft X-rays avoid overlap signal from ultrafast...