A5088823126- Solid State Laser Technologies
- Laser Design and Applications
- Photorefractive and Nonlinear Optics
- Ocular and Laser Science Research
- Advanced Fiber Laser Technologies
- Nail Diseases and Treatments
- Laser Material Processing Techniques
- Connexins and lens biology
- Autoimmune Bullous Skin Diseases
- Photochromic and Fluorescence Chemistry
- Laser Applications in Dentistry and Medicine
- Dermatologic Treatments and Research
- Ultrasound and Cavitation Phenomena
- Intraocular Surgery and Lenses
- Aerospace Engineering and Energy Systems
- Photoacoustic and Ultrasonic Imaging
- Photoreceptor and optogenetics research
- Nonlinear Optical Materials Studies
- Photonic and Optical Devices
- Toxin Mechanisms and Immunotoxins
- Magneto-Optical Properties and Applications
- Laser-Ablation Synthesis of Nanoparticles
- Metal and Thin Film Mechanics
- Sympathectomy and Hyperhidrosis Treatments
- Advanced Fluorescence Microscopy Techniques
ITMO University
2013-2024
Yaroslavl State University
2024
St Petersburg University
2012
We present the development and experimental implementation of diffractive optical elements designed to generate vortices in deep ultraviolet range (from 260 266 nm). These elements, fabricated using advanced lithographic etching techniques, facilitate efficient transformation Gaussian beams into twisted modes carrying orbital angular momentum. Experimental tests conducted laser driver an RF photoinjector at JINR successfully demonstrate generation deep-ultraviolet with a topological charge l...
Subject of Study. The paper discusses the breadboarding results compact diode pumped laser. laser is based on Yb,Er:glass slab active element and frustrated total internal reflection (FTIR) shutter features impact generated pulses at water-containing media. transmitter working in cavity dumping mode provides generation single microsecond or regular trains these with peak power up to 100 kW average output 8 W. allows varying parameters radiation wide range designed for usage technology...
Active Er-laser drug delivery under the nail plate using a drug-impregnated gel containing liquid methylene blue clusters is demonstrated for first time. The effect of agar-agar concentration in and thickness on number Er:YLF-laser pulses required formation through microhole with subsequent active discussed. influence laser pulse energy, thickness, external pressure applied to rate single it investigated. It shown that energy 4.0 ± 0.1 mJ, can reach 0.024 0.004 mg/pulse.
The paper discusses the active delivery of a drug (methylene blue solution) through Er:YLF-laser-perforated nail plate using pulsed radiation microsecond Yb,Er:Glass laser. Different methods laser impact on liquid are considered: by focused and diverging beam. It was established that both discussed can provide sufficient dose for treatment onychomycosis.
Laser microperforation of a human nail plate is an effective method to increase the speed local drugs delivery in treatment diseases. In this paper we present study results influence spatial parameters Er:YLFlaser- produced microhole array (the diameter microholes and their packing density) on rate (<i>v<sub>sp</sub></i>) 0.25 % water-alcohol solution methylene blue penetration through single time (<i>T<sub>mp</sub></i>) required for uniform distribution drug under plate. experiments, was...
Subject of Research.The paper describes the research results an acoustic signal recorded by a hydrophone while effect on liquid microsecond pulses laser radiation with wavelength 1.54 μm and different time substructure. We discuss influence energy substructure pulse magnitude generated pressure drops in removal efficiency cataract eye lens tissues. Method. Microsecond ytterbium-erbium glass peak power "leading" spike equivalent were delivered to volume distilled water through optical fiber....
The study defines threshold values of energy density required for two-photon writing stable fluorescent bit patterns within polymer layers containing chromones class chemical compounds by visual laser pulses in range pulse widths from nanoseconds to femtoseconds. Photo-regrouping non-luminescent products is shown as the result true type absorption (TPA) and stepwise TPA well. In latter case beam fluence can be reduced due increase effective coefficient, but laser-induced thermal damage...
Abstract The results of theoretical and experimental investigations on angular selectivity features a temperature-noncritical electro-optic modulator based the potassium titanyl phosphate crystal are presented. influence walk-off effect contrast inhomogeneity transverse distribution transmittance investigated. value was measured for both half-wave compensated quarter-wave schemes.
The results of <i>in vitro</i> pilot study anterior lens capsule destruction by submicrosecond pulses Yb,Er:Glass laser as well 2% agar gel damage threshold investigation are presented. It was established that the local is possible without any ruptures at energy densities up to 25 J/cm<sup>2</sup> when exposed 30 pulses, delivered via 200 μm optical quartz fiber. found determined minimal value density required for appearance visually identifiable decreases with increase in number pulses....
The results of strobe-photographic study steam-gas cavities formation in a bulk saline as result high-power Yb,Er:Glass laser pulses impact are presented. data on dynamics pulse transmission through the laserproduced cavity for different values distance h between fiber end and cuvette bottom (quartz plate) It was observed that might be used effective non-contact delivery radiation to submerged target: value at maximum size reached 0.87 <i><strong>h</strong></i> = 0.5 mm. influence parameters...
Temperature-noncritical phase matching for frequency conversion in nonlinear crystals is demonstrated both theoretically and experimentally. Dozens percent of efficiencies with hundreds degrees temperature range operation can be obtained within the large spectral band.
The advantages of simultaneous side and end diode pumping Nd:YAG laser to enhance the spatio-temporal characteristics in Q-switched mode operation has been demonstrated. It shown that using a hybrid pump geometry short linear resonator provides superior combination output beam optical quality, energy, pulse duration contrast solitary use an end-pump or side-pump scheme at similar levels average power. We have demonstrated compact single active rod design Q-switching with 18 ns, energy up...
The active delivery of photodynamic agent (aqueous solution methylene blue) under a nail plate is discussed. was implemented by microperforating the using Er:YLF laser radiation and stimulating hydrodynamic processes in drug droplet on surface action Yb,Er:Glass pulses. Optimal pulse energy for effective determined.
Выявлены особенности покрытий HfO 2 /SiO и Ta O 5 , нанесенных на поглощающую подложку из монокристаллического карбида кремния (SiC), вызывающие снижение их лучевой прочности.Экспериментально показано, что вследствие поперечных микросмещений пучка в процессе измерений лучевая прочность образца снижается до 2-3 раз.С использованием уравнения теплопроводности метода конечных элементов системе CAE (computer-aided engineering) проведено моделирование воздействия лазерного излучения с поперечным...
A study and comparison of three algorithms for an optical material image analysis aiming at a determination the laser-induced damage threshold were conducted. The first algorithm is based on integral-representation principle. It makes it possible to compare total brightness images containing laser-damaged area undamaged background area. second Canny edge detector with subsequent contour perimeter calculation. includes several processing steps enhance contrast sharpness in damaged compared...