A5080839666- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Solid State Laser Technologies
- Glass properties and applications
- Optical Network Technologies
- Anorectal Disease Treatments and Outcomes
- Laser Material Processing Techniques
- Pelvic floor disorders treatments
- Particle physics theoretical and experimental studies
- Orbital Angular Momentum in Optics
- Laser-Matter Interactions and Applications
- Advanced Research in Systems and Signal Processing
- CCD and CMOS Imaging Sensors
- Neutrino Physics Research
- Laser Design and Applications
- Spectroscopy and Laser Applications
- Diverticular Disease and Complications
- Colorectal Cancer Surgical Treatments
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Plant Reproductive Biology
- Optical Coherence Tomography Applications
Prokhorov General Physics Institute
2000-2024
Fiber Optics Research Center
2012-2024
Russian Academy of Sciences
2000-2024
Institute of Anthropology and Ethnography
2024
Ministry of Health of the Russian Federation
2023
Moscow City University
2023
Saint Petersburg State Electrotechnical University
2023
Novosibirsk State University
2022
D. Mendeleyev University of Chemical Technology of Russia
2021
First Pavlov State Medical University of St. Petersburg
2016-2021
The authors propose a new simple configuration for 1.24 and 1.48 µm Raman fibre lasers which are promising pumping sources 1.31 amplifiers Er-doped amplifiers, respectively. Efficient resonant conversion of CW 1.06 radiation to the first (1.24 µm) second (1.48 Stokes in phosphosilicate is demonstrated time.
Single-mode optical fibres (SMFs) are required for ITER in-vessel applications as transport to deliver the signal at wavelength λ = 1.55 µm from/to fibre sensors. The paper describes first comparison study of radiation resistance six pure-silica-core SMFs different manufacturers performed in process fission-reactor irradiation conditions corresponding whole lifetime (fast-neutron fluence, flux, γ-dose and dose rate up 1.8·1020n/cm2, 1.08·1014n/(cm2·s), 2.32 GGy 1.39 kGy/s, respectively,...
We report a laser-diode-pumped 1407-nm Raman fiber laser with an output power of 1 W. In this three-cascaded cw laser, based on single active phosphorus-doped silica fiber, for the first time to authors' knowledge successive generation Stokes components essentially different frequency shifts (1330 and 490 cm-1) has been realized. These are associated both constituents (P2O5 SiO2) core glass.
The design of a fiber-optic dosimeter, which determines the radiation dose from difference radiation-induced attenuation (RIA) Δα measured in P-doped silica fiber at λ = 413 and 470 nm, is presented along with its first test results under gamma-radiation (dose rates 0.00064 0.0066 Gy/s, maximal ~2Gy). dose-dependence as well RIA individual wavelengths found to be described by power law, exponent lying range 0.90-0.94. In contrast wavelengths, not depend on rate decay only slightly...
The article is devoted to the effective way of getting images from information board counting register for utility metering. This method based on use open source library OpenCV. image processing algorithm has been represented. calibration video camera allows us reduceerror probability in text recognition. Here are some results experiment.
An all-fiber 1.48-mum generator based on a laser-diode-pumped Yb-doped double-clad laser and cascaded Raman wavelength converter has been developed. Second-order Stokes radiation was generated in phosphosilicate-fiber resonator formed by two pairs of Bragg gratings. A slope efficiency the 48% with respect to power emitted Yb achieved. We obtained an output 1 W at 34% laser-diode array power, total optical-to-optical 23%.
Germania-glass-core silica-glass-cladding single-mode fibers (Δn as great 0.143) with a minimum loss of 20 dB/km at 1.85 µm were fabricated by modified chemical-vapor deposition. The exhibit strong photorefractivity, type IIa index modulation 2×10-3. A Raman gain 300 dB/(km W) was determined 1.12 µm. Only 3 m such is sufficient for constructing the 10-W laser 13-W pump 1.07
The response of a 19 kg active mass liquid argon scintillation detector to gamma, alpha and neutron radiation its characteristic photon time distribution has been studied in the framework Gerda double beta decay research development program. achieved photo-electron yield 1.24 pe/keV was stable during two years operation. exhibits excellent energy resolution 8.7/17.2 keV (σ) for gamma energies 60/239 keV. Radon loaded into study quenching correlation progenies. A robust pulse shape analysis...
An all-fiber electrically tunable loss filter that is based on photoinduced long-period grating coated by Ti-Pt metal coating was developed and investigated. Maximum wavelength tuning of 11 nm with an applied power 0.67 W achieved for the HE17 cladding mode resonance peak.
In-fiber Bragg and long-period gratings as well Mach-Zehnder interferometers based on germanium- nitrogen-doped silica fibers have been investigated under /spl gamma/-rays. The majority of the experimental results suggest that both types in are stable with respect to gamma/-ray doses up 1.47 MGy.
This is the first report, to our knowledge, of refractive-index grating side writing in 10 mol.% GeO(2)-doped fiber by near-UV light a cw Ar(+) laser (333-364 nm). An induced-index magnitude as large 1.9 x 10(-4) at 1.7x10(5) W/cm(2) UV power density has been achieved. The observed gratings have exhibited same temperature stability written KrF excimer (248
A simple, flexible method of postfabrication positioning resonance wavelengths long-period cladding-modecoupled gratings is proposed. This based on changing the outer fiber diameter. Reducing diameter by etching in HF acid shifts loss peaks to higher wavelengths. shift as large 130 nm after 5 min was observed for our strongest grating peak, corresponding cladding mode HE19. The experimental results are excellent agreement with model calculations.
The effect of gamma-radiation on the spectral characteristics FBGs has been studied experimentally. were fabricated in optical fibers with a GeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> concentration core range from several to 99 mol.%. Various pre- and post-fabrication treatments applied aim improve radiation tolerance FBGs. best result was obtained for Type IIa annealed grating written SM310 fiber, where Bragg peak shift...
The paper describes the study of radiation-induced attenuation (RIA) spectra in reactor-irradiated single mode optical fibers (OFs) with differente high-temperature coatings (polyimyde, aluminum and copper). OFs were previously irradiated up to fast neutron fluence 1.8·1020 n/cm2 gamma dose 2.32 GGy. After three years annealing at room temperature (RT), RIA examined within range 650–1700 nm. All mechanisms acting this spectral identified: absorption bands attributed non-bridging oxygen hole...
We report 33% efficient generation of the first Stokes in a high-concentration GeO(2) fiber Raman laser pumped by 22 W thulium-doped laser. An output power 4.6 at 2.105 microm is demonstrated.
For the first time an Ho3+ silica fibre laser has been realised using a Bragg grating as input coupler and pump source at 1.15 µm. The output power of 280 mW 2 µm is to authors' knowledge highest value reported so far for lasers.
We have fabricated bandpass filters based on pi-shifted long-period gratings for application in actively mode-locked erbium fiber lasers. Introducing the pi-phase shift middle of grating opens a within core-cladding mode resonance peaks. With 22-nm bandwidth filter inserted an sigma laser, solitonlike pulses are generated, with power-dependent duration approximately 3-5 ps , at 3-GHz repetition rate. These all-fiber advantages low insertion loss (<0.5 dB) and wide (10-20 nm), they do not...
The article overviews the main properties, fabrication techniques and ares of application long-period fiber gratings. basic theoretical equations describing spectral properties gratings are given. Experimental investigation cladding modes excited by gratings, as well sensitivity grating spectrum to external perturbations discussed. most common examined with reference their advantages disadvantages. important applications long- period Particular attention is paid recent results obtained...
A bismuth-doped-pure-silica holey fiber is fabricated using a preform made by the furnace chemical vapor deposition method. The spectroscopic properties of are studied, and laser action at λ=1450 nm with an efficiency 12% demonstrated.
Writing and thermal annealing of fiber Bragg gratings (FBGs) in an optical containing 75 mol.% GeO2 the core have been studied by analyzing first three diffraction orders FBGs. Double oscillations grating reflectivity has observed during FBG formation H2-loaded fiber, corresponding types revealed labeled as type I(H2), IIa(H2)-, IIa(H2)+. The results obtained shown that negative index change related to IIa photosensitivity cannot be described accumulated UV-dose only, but strongly depends on...
A new technique for long-period fibre grating fabrication using thermally activated diffusion of a core dopant to the cladding region has been proposed. Gratings written in nitrogen-doped with help CO laser or an electric are have exhibited excellent resistance thermal decay.
Abstract Background Elevated levels of low-density lipoprotein cholesterol (LDL-C) and glycosylated hemoglobin (HbA1c) are risk factors for cardiovascular complications. This study evaluated LDL-C goal attainment in Russian clinical practice among patients with moderate to very high risk. The also assessed prescribed lipid-lowering therapy primary compared secondary disease (CVD) prevention, predictors attainment, the proportion individuals diabetes mellitus who achieved HbA1c < 7%....