A5089725277- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Neutrino Physics Research
- Pigment Synthesis and Properties
- Particle physics theoretical and experimental studies
- Calibration and Measurement Techniques
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Historical Astronomy and Related Studies
- Laser-Matter Interactions and Applications
- Radioactivity and Radon Measurements
- Astronomical Observations and Instrumentation
- Solid State Laser Technologies
- Particle Detector Development and Performance
- Photodynamic Therapy Research Studies
- Hemoglobin structure and function
- Copper Interconnects and Reliability
- Porphyrin and Phthalocyanine Chemistry
- Phase Equilibria and Thermodynamics
- Biofield Effects and Biophysics
- Dark Matter and Cosmic Phenomena
Fiber Optics Research Center
2011-2024
Prokhorov General Physics Institute
2020-2024
Photonics (United States)
2023
Russian Academy of Sciences
2003-2021
Ulyanovsk State University
2015
Institute for Nuclear Research
2006-2013
Institute of Laser Physics
1999-2002
A.M. Obukhov Institute of Atmospheric Physics
1991
The Gerda collaboration is performing a search for neutrinoless double beta decay of 76Ge with the eponymous detector. experiment has been installed and commissioned at Laboratori Nazionali del Gran Sasso started operation in November 2011. design, construction first operational results are described, along detailed information from R&D phase.
The primary goal of the GERmanium Detector Array (Gerda) experiment at Laboratori Nazionali del Gran Sasso INFN is search for neutrinoless double beta decay 76 Ge.High-purity germanium detectors made from material enriched in Ge are operated directly immersed liquid argon, allowing a substantial reduction background with respect to predecessor experiments.The first 5.04 kg•yr data collected Phase I have been analyzed measure half-life neutrinoaccompanied Ge.The observed spectrum energy range...
We report a new ytterbium-doped active tapered fibre used in the output amplifier stage of laser system for generation megawatt peak power ultrashort pulses microjoule energy range. The is single-mode at its input end (core and cladding diameters 10 ) multimode (diameters 45 ), but are amplified quasi-single-mode regime. Using hybrid Er/Yb comprising an erbium master oscillator wavelength near , nonlinear converter to range three-stage amplifier, we obtained duration, which were then...
An all-silica photonic bandgap fiber with a cladding index difference of approximately 2 % and diameter-to-pitch ratio (d/wedge) 0.12 was fabricated studied. To our knowledge, this is the first report on properties such small d/wedge. The single-mode in fundamental bandgap. mode field diameter 1000-1200 nm wavelength range 19-20 microm. minimum loss same 20 dB/km for 30-cm bending diameter. In opinion, can serve as potential candidate achieving propagation large area.
A design of a polarizing all-glass Bragg fiber with microstructure core has been proposed for the first time. This provides suppression high-order modes and one polarization states fundamental mode. The was fabricated by new, simple method based on combination modified chemical vapor deposition (MCVD) process rod-in-tube technique. mode field area found to be about 870 μm² near λ=1064 nm. extinction ratio better than 13 dB observed over 33% wavelength range (from 1 1.4 μm) after propagation...
This paper presents the results of a detailed theoretical study bending properties original all-glass leakage channel microstructured optical fibers (LC MOFs) over radius range from 3 cm to 11 cm. These LC MOFs contain two layers fluorine-doped silica glass elements with reduced refractive index, different diameters, and distances between them. We determined spatial distributions electric field components modes in addition usual parameters such as effective indices, losses, intensity...
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.
This paper presents results of a theoretical analysis and series experiments dealing with microstructured optical fibre (MOF) drawing from preforms sealed at their top end. We demonstrate that maintaining constant temperature in the part preform is key importance for ability to produce long MOFs stable parameters. have proposed implemented technique additional, controlled heating preforms, which allows one fabricate both varying Evidence provided holes differing size can be produced rather...
The paper presents the results of theoretical and experimental studies all-glass leakage channel microstructured optical fibers (MOFs) with a large mode area low bending losses. These MOFs contain two layers fluorine-doped silica glass elements reduced refractive index, different diameters, distances between them. A numerical analysis properties these was performed using finite element method. losses for fundamental higher-order modes were calculated in spectral range from 0.65 μm to 1.65...
This paper presents the results of a detailed theoretical study bending properties all-glass leakage channel microstructured optical fibers (LC MOFs) with polymer coating over radius range from 4.8 cm to 10 cm. The dependencies effective refractive indices LC MOF modes on have number crossings and anticrossings for different mode pairs. A analysis showed that eight each polarization be considered correctly calculate losses. These can classified into relatively strong (three polarization)...
We proposed and investigated a novel tapered ytterbium-doped fiber design. The has length of 2.1 m, single-mode thin end thick with core/clad diameter about 50/430 µm. Master-oscillator power-amplifier monolithic scheme have been developed using this 5 ps duration, 28 nm spectral width 0.5 MW peak power pulses was achieved at the output. FROG measurements reveal linear chirp that allow one to expect decompression these down sub-100 fs duration.
Highly birefringent microstructured fibers (HB MSFs) with similar mode field sizes along the two orthogonal axes have been presented. The core of HB MSF is surrounded by or more concentric rings having identical circular air holes. key feature this setup that first ring contains one pairs holes, which are widely spaced than others, i.e., they wider bridges. shape may be elliptical. MSFs were characterized using finite element method. Simulation results show a certain relationship between...
Chirped pulse monolithic fiber amplifier based on a newly developed tapered polarization maintaining Yb-doped has been and optimized. A novel amplification regime in relatively long (220 cm) of improved design, which theoretically predicted, allowed us to achieve an ultimate high peak power. In this regime, the signal propagates most without growths very rapidly only last 80 cm fiber, mode field area approximately 1000 μm<sup>2</sup> near output. We have demonstrated 20 ps chirped pulses...
A novel design of polarization-maintaining microstructured fiber is presented. solid core surrounded by two or more concentric rings holes constant diameter. The distance between adjacent in the first ring except for one pairs holes, which spacing increased. It found that such a can demonstrate high birefringence (up to 5x10<sup>-3</sup>) and simultaneously low azimuthal asymmetry mode shape. An experimental sample was fabricated. measured value excellent agreement with calculated one....
Photonic bandgap Bragg fibers are promising for designing large-mode-area structures owing to their high bend immunity. However, at a large core diameter, filtering of high-order modes (mainly, the LP<sub>11</sub> mode) becomes difficult, because propagation constant such is close that fundamental LP<sub>01</sub> mode. In this paper, we demonstrate possibility suppress in by introducing low-index inclusions into fiber core. Numerical analysis shows an appropriate choice position and types...
Abstract We have proposed a new design of microstructured optical fibres (MOFs), containing three rings identical circular holes around core, with different separations between the rings. The properties MOFs been analysed numerically using finite element method (FEM), and leakage loss in spectral range 0.40 – 2.65 μm has calculated for fundamental higher order modes at various parameters MOFs. demonstrated presence several local maxima dependences examined physical mechanism responsible...
A novel birefringent microstructured fibre (BMF) design is proposed, and its birefringence dispersion characteristics are analysed using the finite element method. The results indicate that proposed BMF ensures high (∼5×10-3) at a low mode asymmetry. At certain core ellipticity, configurations considered may have equal field sizes along two orthogonal axes.
A demonstration is given of the feasibility two-photon excitation aluminium phthalocyanine and pharmaceutical preparation 'Fotosens', used in photodynamic therapy. The source was an Nd:YAG laser emitting at 1064 nm wavelength. spectra two-photon-excited luminescence were obtained absorption cross sections determined.
In this paper we continue numerical and experimental investigations of highly birefringent microstructured fibers (HiBi MSFs) proposed earlier. These HiBi MSFs have an elliptical or circular core surrounded by two more concentric rings holes constant diameter d. The in the first ring around equal spacing Λ between centers, except one pairs with increased Λ1. For convenience, use following code name characterizing new MSF structure: MNKLec, where M is number ring; N gaps K additional holes,...