A5027834822- Laser Material Processing Techniques
- Computational Fluid Dynamics and Aerodynamics
- Laser-induced spectroscopy and plasma
- Laser-Ablation Synthesis of Nanoparticles
- Laser-Plasma Interactions and Diagnostics
- Diamond and Carbon-based Materials Research
- Fluid Dynamics and Turbulent Flows
- Ion-surface interactions and analysis
- Gas Dynamics and Kinetic Theory
- Aquatic and Environmental Studies
- Advanced Surface Polishing Techniques
- Geotechnical and Geomechanical Engineering
- High-pressure geophysics and materials
- Surface Treatment and Residual Stress
- Integrated Circuits and Semiconductor Failure Analysis
- Ocular and Laser Science Research
- Nonlinear Optical Materials Studies
- Advanced X-ray Imaging Techniques
- Solid-state spectroscopy and crystallography
- Thermography and Photoacoustic Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Navier-Stokes equation solutions
- High-Energy Particle Collisions Research
Institute for Computer Aided Design
2015-2024
Development Agency of Serbia
2024
Russian Academy of Sciences
2001-2022
Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science
2022
Landau Institute for Theoretical Physics
2010-2019
University of South Florida
2010
Joint Institute for High Temperatures
2010
Estonian Academy of Sciences
1981-1983
Czech Academy of Sciences, Institute of Physics
1983
Institute for Theoretical and Experimental Physics
1972-1977
Abstract Fundamental physical phenomena in metals irradiated by ultrashort laser pulses with absorbed fluences higher than few tens of mJ/cm 2 are investigated. For those fluences, laser‐produced electron distribution function relaxes to equilibrium Fermi temperature T e within a short time 10‐100 fs. Because the subsystem has highly exceeding much ion i well‐known twotemperature hydrodynamic model (2T‐HD) is used evaluate heat propagation associated hot conductive diffusion and electron‐ion...
Abstract We combine theoretical and experimental methods to study the processes induced by fast laser heating of metal foils. These reveal themselves through motion frontal (irradiated) rear‐side foil boundaries. The irradiated targets are 0.3‐2 micron thick aluminum foils deposited on much thicker (150 microns) glass plate. instant boundary positions is measured pump‐probe technique having ∼40‐150 fs time ∼1 nm spatial resolutions. Ultrashort pulse transforms a surface layer with thickness...
We irradiated the soft x-ray laser (SXRL) pulses having a wavelength of 13.9 nm, duration time 7 ps, and fluences up to 27 mJ/cm2 aluminum (Al) surface. After irradiation process, modified surface was observed with visible microscope, scanning electron atomic force microscope. The modifications caused by SXRL were clearly seen, it found that conical structures about 70–150 nm in diameters formed under single pulse shot. features average depth 40 this value accordance attenuation length beam...
Laser shock peening with ultrashort laser pulses has been studied by hydrodynamic and atomistic simulations, as well experimentally. It shown that, in contrast to traditional nanosecond pulses, allow one increase the produced pressures two or three orders of magnitude from 1–10 GPa 1000 (1 TPa). The physics phenomena changes fundamentally because waves generating exceeding bulk modulus a metal melt it. for first time that melting depth at about 1 TPa is an order larger than thickness layer...
Abstract Ultrashort X‐ray laser pulse acts onto electron subsystem of dielectrics such as LiF and transfers matter into a two‐temperature state with hot electrons excited by the from valence to conduction band. Because small heat conduction, hydrodynamic motion proceeds in adiabatic regime keeping radiation attenuation depth D att only scale spatial distribution. Hydrodynamic qualitatively changes absorbed energy increase. At low fluences F ∼ 10mJ/cm 2 spallative removal remaining solid...
Abstract The hot luminescence of self‐trapping excitons is discovered in NaI and KI single crystals. temperature behaviour emission spectra the range 4.2 to 170 K corresponding excitation are studied. Basing on theory resonant secondary developed recently a description observed terms relaxation configurational coordinate given. calculations local lattice dynamics self‐trapped exciton determining its law shape presented. A comparison with experiment provides detailed picture into state.
Pump‐probe technique provides an unique method for high precision measurement of ultrafast processes induced in material by ultrashort laser pulses. The time domain and space available measurements are 0.1–1000 ps 1–1000 nm, respectively. In this respect the pump‐probe noticeably extends to smaller scales well‐known Doppler Velocity Interferometer System Any Reflector (VISAR) Optically Recording (ORVIS) methods, which have micron‐nanosecond accuracy. VISAR ORVIS widely used study wave...
The paper is devoted to experimental and theoretical studies of ablation condensed matter by optical (OL), extreme ultraviolet (EUV) X-ray lasers (XRL). Results obtained at two different XRL are compared. first collision Ag-plasma laser with pulse duration τ<sub>L</sub> = 7 ps energy quanta <i>hv</i>=89.3 eV, while the second one EUV free electron (EUV-FEL) has parameters 0.3 20.2 eV. It shown that thresholds for these LiF dielectric approximately same. A theory presented which explains...
An experimental and theoretical study has been carried out of the ablation a solid insulator with wide band gap (LiF) under action ultrashort laser pulses UV range, obtained in free-electron (pulse width τ<sub>L</sub>=0.3ps, photon energy ħω<sub>L</sub>=20.2eV), soft X-ray region, silver-plasma (τ<sub>L</sub>=7ps, ħω<sub>L</sub>=89.3eV). A comparison is made results on two systems. It shown that threshold about same for both lasers. theory...
Interaction of ultrashort laser pulse with metals is considered. Ultrafast heating in our range absorbed fluences F<sub>abs</sub> > 10 mJjcm<sup>2</sup> transfers matter into two-temperature (2T) state and induces expressed thermomechani cal response. To analyze case, where 2T, thermomechanical, multidimensional (formation surface structures) effects are significant, we use density functional theory (DFT), solutions kinetic equations τ- approximation, 2T-hydrodynamics, molecular...
Femtosecond laser irradiation of a thin gold film deposited on the thick glass substrate is considered. The thickness has order few microns and focal spot small. Underlying physics processes after studied with combined approach two-temperature hydrodynamic MD simulations. Found are two adsorbed fluence thresholds Fs < Fa three regimes motion, in comparison freestanding film. There oscillatory mode when oscillates remaining for 0 F Fs. For breaks away from because negative pressure overcomes...
The dynamic processes which take place during high-speed impact of two metal plates with different densities are investigated using three-dimensional numerical simulations. It is shown that as a result the Rayleigh-Taylor instability forms leads to formation ring-shaped structures on surface smaller density. comparative analysis metals interface deformation process use equations state performed.
The results of theoretical and experimental study vibrational relaxation processes in impurity centres with a strong electron-phonon interaction are presented. General expressions obtained which describe the temporal evolution configurational-coordinate distribution function envelope emission spectrum consisting ordinary hot luminescence. problem is solved exactly harmonic approximation allowance made for both linear quadratic vibronic coupling providing small number actual configurational...