A5020582644- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Terahertz technology and applications
- Laser-Ablation Synthesis of Nanoparticles
- Ion-surface interactions and analysis
- Photonic and Optical Devices
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Semiconductor Quantum Structures and Devices
- Laser-Matter Interactions and Applications
- Ocular and Laser Science Research
- Diamond and Carbon-based Materials Research
- Acoustic Wave Resonator Technologies
- Thermography and Photoacoustic Techniques
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Nonlinear Optical Materials Studies
- Advanced Materials Characterization Techniques
- Photonic Crystals and Applications
- High-Velocity Impact and Material Behavior
- Advanced Surface Polishing Techniques
- Silicon Nanostructures and Photoluminescence
- 3D Printing in Biomedical Research
- Gyrotron and Vacuum Electronics Research
Joint Institute for High Temperatures
2015-2024
Russian Academy of Sciences
1999-2021
Plasma (Russia)
2014-2017
Joint Institute for Nuclear Research
2014-2015
Technical University of Darmstadt
2011
Institute for Computer Aided Design
2010
Landau Institute for Theoretical Physics
2010
University of South Florida
2010
Institute for High Energy Physics
2006
Institute of Thermal Physics
2004
We report on high-field terahertz transients with 0.9-mJ pulse energy produced in a 400 mm2 partitioned organic crystal by optical rectification of 30-mJ laser centered at 1.25 μm wavelength. The phase-locked single-cycle pulses cover the hard-to-access low-frequency range between 0.1 and 5 THz carry peak fields more than 42 MV/cm 14 Tesla potential to reach over 80 choosing appropriate focusing optics. scheme based Cr:Mg2SiO4 offers high conversion efficiency 3% using uncooled crystal....
We investigated Terahertz generation in organic crystals DSTMS, DAST and OH1 directly pumped by a Cr:forsterite laser at central wavelength of 1.25 μm.This pump technology provides laser-to-THz energy conversion efficiency higher than 3 percent.Phase-matching is demonstrated over broad 0.1-8 THz frequency range.In our simple setup we achieved hundred μJ pulses tight focus resulting electric magnetic field larger 10 MV/cm Tesla.
Second Harmonic Generation induced by the electric field of a strong nearly single-cycle terahertz pulse with peak amplitude 300 kV/cm is studied in classical inorganic ferroelectric thin film (Ba0.8Sr0.2)TiO3. The dependences SHG intensity on polarization incoming light revealed and interpreted terms plane film. As THz pumps medium range phononic excitations, explained as dynamical change ferrolectric order parameter. It estimated that under action parameter acquires an in-plane component...
We report on the experimental observation of high-power terahertz-radiation-induced damage in a thin aluminum film with thickness less than terahertz skin depth. Damage metal produced by single pulse is observed for first time. The mechanism induced could be attributed to thermal expansion causing debonding from substrate, cracking, and ablation. pattern multiple pulses at fluences below threshold quite different that single-pulse experiments. resembles an array microcracks elongated...
The development of an IR terawatt Cr : forsterite femtosecond laser system with a pulse energy 90 mJ and duration 80 fs is reported. assembled using Russian components only has no analogues in the world.
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...
We consider the thermodynamic and kinetic properties of Nickel as an example transition metal in two-temperature state (Te≫Ti,) produced by femtosecond laser heating. Our physical model includes essential processes induced metals ultrafast energy absorption. Specifically, electron-ion collision frequency was obtained from recent high-temperature measurements electrical conductivity electron-electron screened Coulomb scattering calculated taking into account s-s s-d collisions. In addition,...
Using an interferometric continuous monitoring technique, we have investigated the motion of surface aluminium target in case femtosecond laser ablation at picosecond time delays relative to instant exposure. Measurements temporal dispersion dynamics, molecular dynamics simulation results and morphology crater demonstrated a thermomechanical (spall) nature disruption condensed phase due cavitation-driven formation growth vapour nuclei upon melt expansion, followed by nanostructures...
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 studied the shock-wave and ablation phenomena in tantalum films of submicron thicknesses irradiated by femtosecond laser pulses. The single-shot spectral interferometry was used for continuous diagnostics movement a picosecond range both frontal rear surfaces sample. Measured displacement histories were converted into surface velocity histories. As result, new data on shear tensile strength have been obtained solid molten at strain rate ∼ 109 s-1.
Abstract The experimental findings on the second harmonic generation (SHG) in centrosymmetric crystal silicon are reported. SHG is induced by extremely high electric field (up to 15 MV/cm) parallel surface of a short terahertz (THz) pulse while probing an infrared femtosecond optical pulse. under such unique conditions reported for first time. At amplitude above 8 MV/cm, quadratic dependence yield integrated over THz duration violated and not changed with further increase field. Saturation...