Dr. Stanislav O. Leonov Profile

Dr. Stanislav O. Leonov

at Bauman Moscow State Technical Univ

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Publications (5)

Proceedings Article | 18 April 2021 Presentation + Paper

Recent progress in single-crystal Fe:CdTe lasers

Mikhail Frolov, Yuriy Korostelin, Vladimir Kozlovsky, Stanislav Leonov, Peter Fjodorow, Yan Skasyrsky

Proceedings Volume 11777, 117770H (2021) https://doi.org/10.1117/12.2589055

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Proceedings Article | 23 May 2018 Presentation

Hollow-core antiresonant fibers optimized for operation in the spectral range 0.6-2.5 µm (Conference Presentation)

Vladimir Demidov, Alexander Khokhlov, Stanislav Leonov, Vladislav Tigaev, Elizaveta Yelistratova, Peter Agruzov, Alexander Komarov, Vladislav Ananyev, Egishe Ter-Nersesyants, Peter Zlobin, Nikolay Nikonorov

Proceedings Volume 10681, 1068104 (2018) https://doi.org/10.1117/12.2314884

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Hollow-core fibers (HCFs) which guide light by an antiresonant reflection from arrays of silica walls have been attracting much interest due to their extraordinary optical properties and potential interdisciplinary applications including highly efficient laser-matter interaction, ultra-short pulse delivery, pulse compression and low-loss mid-infrared transmission. There are several types of HCFs having either a photonic crystal cladding, Kagome lattice or a single cycle of capillaries surrounding the core. In the latter case the antiresonant guidance properties depend strongly on the core size and the shape of the core/cladding boundary. In this work, we focus on the capabilities of two HCF designs (negative curvature of the core/cladding boundary and nodeless capillary structure) to obtain a nearly single-mode guidance from the visible to the mid-infrared spectral regions. The first HCF (Sample A) was drawn from the stack comprising a cycle of eight touching capillaries having the wall thickness 1.5 µm which provided a negative curvature of the core/cladding boundary. The fiber was intentionally manufactured with the trapezoidal shape of the capillaries in order to minimize the interaction between the surface modes, trapped amidst the touching trapezoids, and the fundamental mode in a hollow core. The negative curvature of the boundary resulting in the octagonal shape of the core was achieved by putting an excess gas pressure inside the capillaries during the drawing process. The second HCF (Sample B) was produced from the stack comprising a cycle of six non-touching capillaries having the wall thickness 2.5 µm with a view to restrict the abovementioned interaction via breaking the surface modes coupling between the adjacent capillaries. As in the first case, the gas pressure was controlled carefully to keep all capillaries separately from each other. In both samples the core diameter was equal to 50 µm ensuring a relatively large effective mode area. Taking into account the periodic nature of HCFs transmission windows, we simulated and measured accurately transmission spectra and modal properties of the fibers. The simulations were performed using the finite element analysis. The transmission spectra were measured by passing light from the tungsten halogen lamp through the samples of 35 cm long and registering output signal applying three optical spectrometers covering the wavelength range 600-2500 nm. We observed a good agreement between the simulation and the experiment. The Sample A has transmission windows at the wavelengths 650, 750, 850-900, 950-1050, 1150-1300, 1450-1700, 2000-2300 nm and the Sample B – at the wavelengths 600, 650-700, 750-800, 850-950, 1000-1100, 1150-1350, 1450-1750, 1900-2400 nm. The mid-infrared window for the Sample B is larger and more pronounced in terms of relative transmission due to the larger wall thickness at the core/cladding boundary. Moreover, the Sample B is predicted to be practically single-mode in the considered spectral region, as the losses of the most competitive higher-order modes are estimated to be much above 1 dB/m. A similar regime for the Sample A is expected only when operating at the long-wavelength limit of the spectral region, due to the increase in the fundamental and higher-order modes refractive index difference.

Proceedings Article | 26 June 2017 Paper

Fiber Bragg gratings strain measuring system and a sensor calibration setup based on mechanical nanomotion transducer

Vladimir Lazarev, Stanislav Leonov, Mikhail Tarabrin, Valerii Karasik

Proceedings Volume 10329, 103292F (2017) https://doi.org/10.1117/12.2270160

KEYWORDS: Packaging, Nondestructive evaluation, Sensors, Calibration, Fiber Bragg gratings, Sensor calibration, Fiber optics sensors, Structural health monitoring

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Proceedings Article | 6 January 2015 Paper

Stanislav Sazonkin, Alexander Krylov, Dmitriy Dvoretskiy, Stanislav Leonov, Vladimir Lazarev, Alexey Pnev, Valeriy Karasik, Vyacheslav Grebenyukov, Anatoly Pozharov, Elena Obraztsova

Proceedings Volume 9450, 945004 (2015) https://doi.org/10.1117/12.2069593

KEYWORDS: Mode locking, Fiber lasers, Standards development, Pulsed laser operation, Polarization, Dispersion, Carbon, Radio optics, Laser resonators, Nanostructures

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Proceedings Article | 1 May 2014 Paper

Nonlinear picosecond pulse transformation in large-core microstructured fibers

Alexandra Pasishnik, Stanislav Leonov

Proceedings Volume 9136, 91361F (2014) https://doi.org/10.1117/12.2051599

KEYWORDS: Optical fibers, Dispersion, Picosecond phenomena, Photonic crystal fibers, Wave propagation, Waveguides, Pulsed laser operation, Fiber lasers, Ytterbium, Four wave mixing

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