A5008425726- Nonlinear Optical Materials Research
- Photorefractive and Nonlinear Optics
- Laser Material Processing Techniques
- Laser Design and Applications
- Optical and Acousto-Optic Technologies
- Crystallization and Solubility Studies
- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Nonlinear Optical Materials Studies
- Solid-state spectroscopy and crystallography
- Spectroscopy and Quantum Chemical Studies
- Laser Applications in Dentistry and Medicine
- Optical Systems and Laser Technology
- Photoacoustic and Ultrasonic Imaging
- Optical Coherence Tomography Applications
- Near-Field Optical Microscopy
- Laser-Plasma Interactions and Diagnostics
- Semiconductor Lasers and Optical Devices
- Optical Imaging and Spectroscopy Techniques
- Quantum Dots Synthesis And Properties
- Nanomaterials and Printing Technologies
- Geochemistry and Geologic Mapping
- Chemical and Physical Properties in Aqueous Solutions
- Anesthesia and Pain Management
- Kidney Stones and Urolithiasis Treatments
Institute of Applied Physics
2010-2022
A.M. Obukhov Institute of Atmospheric Physics
2018-2022
South-West State University
2021-2022
Privolzhsky Research Medical University
2017-2019
Urology Team
2019
Medical Technologies (Czechia)
2019
Russian Academy of Sciences
1999-2014
CONTENTS 1. Introduction 299 2. General Relations for Two-Photon Transitions 3. Experimental Technique 301 4. Two-Quantum in Molecules and Molecular Crystals 302 5. Absorption Semiconductors Ionic 308 References 318
Colloidal particle lens array (CPLA) proved to be an efficient near-field focusing device for laser nanoprocessing of materials. Within CPLA, spherical particles do not act as independent microlenses. Due the coupling modes, field near clusters microparticles cannot calculated by means superposition Mie solutions individual spheres. In paper, electromagnetic distributions laser-irradiated dielectric microspheres with configurations that match fragments close-packed CPLA are studied. It is...
We consider nanopatterning of dielectric substrates by harmonics single powerful femtosecond pulses from a Ti:Sapphire laser. The is mediated closely packed monolayers polystyrene microspheres that act as microlenses at the surface. Observed modification material proceeds via ionization. By our theory, second harmonic more effective in multi-photon ionization and better focused than fundamental frequency which multiplying amount free electrons impact Experiments show conversion part pulse...
We consider laser nanostructuring of the material surface by means a colloidal particle lens array. Here, monolayer dielectric micro- or nanospheres placed on acts as an array near-field lenses that focus radiation into multitude distinct spots, allowing formation many structures in single stage. show conversion small part energy femtosecond beam second harmonic (SH) is efficient way to increase density obtained nanostructures. By combining fundamental frequency and SH, one benefits both...
We present a theoretical model for laser cutting of biological tissue by strongly heated fiber tip with highly absorbing coating.A significant dependence the speed and depth on inclination angle scalpel to surface when scattering exceeds absorption in is shown.Experimental evidences this effect are presented.In experiment, we used silica coating made carbon silicon organic varnish, 0.97-µm wavelength porcine skin.The additional opportunity increase efficiency deposition layer considered.
We present a laser resection technique to be used when biotissue is heated by radiation the temperature of material softening and then moved apart lateral edge optical fiber with strongly absorbing tip. The tip allows decrease in power effective cutting scalpel at wavelength 0.97 μm. And it changes speed as well characteristics damage tissues adjacent incision experiments on model media experimental animals.
An investigation was made of the transparency, homogeneity, and optical strength KDP DKDP crystals grown at rates much higher (by a factor 25–30) than usual. A comparison with properties conventional rates. The results indicated that, in principle, it should be possible to grow this way suitable for use quantum electronics.
This paper considers the surface nanostructuring of polymers and glasses by femtosecond laser pulses using an array colloidal particles as a focusing system. We demonstrate that partial conversion pulse energy into second harmonic considerably reduces modification threshold size resulting structural elements. At intensities above , (ablation swelling) occurs through free carrier generation. In this process, is more efficient in multiphoton ionisation, whereas fundamental impact ionisation....
The aim of the investigation was to evaluate cutting properties a laser scalpel by applying heavily absorbing coatings (HAC) on an operating silica fiber end.Materials and Methods.In we used with wavelength 0.97 µm output power 3 7 W. Tissue incised without coating coated carbon layer or graphite-based HAC.Results.The assessment ex vivo tissue incision rate showed HAC tip provide maximum rate.Moreover, mode characterized minimum coagulation area.Incision width is slightly less than that...
We have experimentally demonstrated the existence of super-broadband non-degenerated phase matching for a signal with wavelength 911 nm in KD*P crystal pumped 527nm. Parametric amplification coefficient more than 10<sup>7</sup> three cascades is achieved. This resulted pulse energy 10mJ at output third cascade. It shown that chirped pulses conventional femtosecond sources (a Ti:Sa laser and Cr:forsterite 1250 nm) can be amplified up to level ensures multipetawatt power after compression.
The conversion of the 'Iskra-5' iodine laser to regime fusion target irradiation by second harmonic radiation at 657.5 nm is reported. upgrading enabled obtaining from 12 channels a total second-harmonic energy yield 2.5 kJ, which corresponds an output power 5 TW. efficiency was equal ∼50% in experiments with DKDP crystals aperture 35 cm. A series 12-channel conducted involving microtargets.
Step bunching in crystal growth from solutions is investigated theoretically the approximation of nonstationary mass transport diffusion layer assigned thickness. It shown that this model described by a set equations, including equation for layer, one-dimensional step motion equation, boundary conditions relating these and condition at boundary. This equations has form coupled traveling periodical soliton-like waves density steps n relative supersaturation σ x on growing surface. The...
The aim of the study was to evaluate developed technique contact lithotripsy using a strongly heated distal tip fiber providing controlled fragmentation urinary stones.Materials and Methods.Postoperative kidney stones were used as research objects.For renal calculi we applied standard 0.97 µm diode laser with continuous wave regime, power 15 W. As absorbing coating (SAC), solution graphite carbon microparticles in silicone varnish.SAC localized at end light guide multimode quartz fiber,...