- Laser Material Processing Techniques
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Laser-Ablation Synthesis of Nanoparticles
- Laser-Plasma Interactions and Diagnostics
- Diamond and Carbon-based Materials Research
- High-Velocity Impact and Material Behavior
- Ocular and Laser Science Research
- High-pressure geophysics and materials
- Advanced Surface Polishing Techniques
- Metal and Thin Film Mechanics
- Surface Treatment and Residual Stress
- Laser-Matter Interactions and Applications
- Energetic Materials and Combustion
- Thermography and Photoacoustic Techniques
- nanoparticles nucleation surface interactions
- Advanced X-ray Imaging Techniques
- Laser Design and Applications
- Surface Roughness and Optical Measurements
- Force Microscopy Techniques and Applications
- Electromagnetic Fields and Biological Effects
- Integrated Circuits and Semiconductor Failure Analysis
- bioluminescence and chemiluminescence research
- Photonic Crystals and Applications
- Fluid Dynamics and Thin Films
Joint Institute for High Temperatures
2014-2023
Russian Academy of Sciences
2009-2015
Landau Institute for Theoretical Physics
2010
Institute for Computer Aided Design
2010
University of South Florida
2010
Russian Academy of Natural Sciences
2009
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...
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.
We present the results of studying morphology modified surface aluminium, nickel and tantalum after ablation layer by a femtosecond laser pulse. The sizes characteristic elements cellular nanostructure are found to correlate with thermo-physical properties material intensity radiation.
Abstract We report on the ablation phenomena in gold sample irradiated by femtosecond laser pulses of moderate intensity. Dynamics optical constants and expansion a heated surface layer was investigated range from picosecond up to subnanosecond using ultrafast interferometry. Also morphology craters value an threshold (for absorbed fluence) were measured. The experimental data are compared with simulations mass flows obtained two-temperature hydrodynamics molecular dynamics methods....
An interferometric method is developed and realised using a frequency-modulated pulse for diagnosing dynamics of fast deformations with spatial temporal resolution under the action single laser pulse. The free surface submicron-thick aluminium film studied an ultrashort compression amplitude up to 14 GPa, excited by femtosecond heating target layer. spallation strength was determined at record high deformation rate 3 × 109 s−1.
Action of ultrafast optical and X-ray lasers on metals is considered. It known that under certain conditions surface structures appear as result irradiation. Generation nano-structures usually associated with excitation plasmons. But often do not have forms ripples, their spacial scales are order magnitude less than wavelength. In the paper full description given for case single shot laser action onto well polished boundaries. Plasmon effects insignificant this also pulses. shown formed...
The shock compression of magnesium (Mg-4Al-2Zn) alloy polycrystalline films on glass under ultrashort loads driven by sub-picosecond laser pulses was investigated. continuous diagnostics motion and reflectivity changes the free rear surface samples carried out in picosecond range (≤200 ps) a single pulse mode using ultrafast spectral interferometry. We present data elastoplastic wave evolution at propagation distance several hundreds nanometers, elastic precursor decay, shear, tensile...
Elastoplastic and polymorphic α–ε transformations in iron films induced by ultra-short laser-driven shock waves are studied. Interpretation of time-resolved interferometric measurements is performed using an inverse analysis technique experimental rear-side velocity profiles. The lasts obtained numerical differentiation free surface displacements detected probe laser pulses. techniques validated consistent two-temperature hydrodynamics molecular dynamics simulations energy deposition...
THz radiation induces a variety of processes in cells and has attracted the attention researchers recent decades. Here, data on effects high-intensity terahertz (THz) human directly reprogrammed neural progenitor (drNPCs) neuroblastoma (SK-N-BE (2)) were obtained for first time. The results demonstrated that exposure non-tumor tumor to broadband (0.1-3 THz) pulses with intensity 21 GW/cm
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Sergey I. Ashitkov, Nail A. Inogamov, Pavel S. Komarov, Vasily V. Zhakhovsky, Ivan Oleynik, Mikhail B. Agranat, Gennady Kanel, Vladimir E. Fortov; Strength of metals in liquid solid states at extremely high tension produced by femtosecond laser heating. AIP Conf. Proc. 30 July 2012; 1464 (1): 120–125....
The results of experimental and theoretical investigations shock-wave propagation in bcc iron under ultra-short loads driven by femtosecond laser pulses are presented. Chirped pulse interferometry was used for continuous diagnostics movement a picosecond range the rear-side surface thin films. evolution elastic-plastic shock waves samples with different thicknesses purity has been studied. obtained HEL spall strength close to ultimate values shear tensile stresses. Response single-crystal...
Time and spatial-resolved interferometric technique in a picosecond range was used for continuous registration of motion iron target surface heated by femtosecond laser pulse. The magnitude the tensile stress 0.5-1.3 GPa leading to fracture molten at strain rate ∼ 109 s-1 experimentally determined from measured velocity histories spalled layer movement.
The amplitude and phase of the complex reflection coefficient a weak probe laser pulse from strongly coupled Al plasma created on surface metallic target by pump femtosecond pulses with intensities I ≤ 10 15 W cm ―2 were measured using interference microscopy. A theoretical model developed for interaction intense ultrashort solid targets basis two-temperature equation state an irradiated substance was used numerical simulations dynamics formation expansion plasma. comparison experimental...