Výsledky vyhledávání - "Andrey Umnikov"

Akademický článek

Bismuth-Doped Fiber Lasers and Amplifiers Operating from O- to U-Band: Current State of the Art and Outlook

Autor: Sergey Alyshev, Aleksandr Khegai, Andrey Umnikov, Sergei Firstov

Publikováno v: Photonics, Vol 11, Iss 7, p 663 (2024)

The development of unique optical materials that provide amplification and lasing in new wavelength ranges is a major scientific problem, the solution of which is becoming the basis for the emergence of new optical technologies, which are primarily t

Externí odkaz: https://doaj.org/article/54ae915838584259bb0d107f013d5449

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Akademický článek

Highly Er/Yb-Co-Doped Photosensitive Core Fiber for the Development of Single-Frequency Telecom Lasers

Autor: Denis Lipatov, Olga Egorova, Andrey Rybaltovsky, Alexey Abramov, Alexey Lobanov, Andrey Umnikov, Mikhail Yashkov, Sergey Semjonov

Publikováno v: Photonics, Vol 10, Iss 7, p 796 (2023)

A highly erbium- and ytterbium-co-doped photosensitive fiber with a germanophosphosilicate glass core was fabricated by the MCVD method, utilizing an all-gas-phase deposition technique developed “in-house”. Due to doping with germanium oxide (GeO

Externí odkaz: https://doaj.org/article/42fe0bb286394257835ca28fa84d7d39

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Akademický článek

Optimization of the Core Compound for Ytterbium Ultra-Short Cavity Fiber Lasers

Autor: Andrey Rybaltovsky, Mikhail Yashkov, Alexey Abramov, Andrey Umnikov, Mikhail Likhachev, Denis Lipatov

Publikováno v: Fibers, Vol 11, Iss 6, p 52 (2023)

Highly ytterbium-, aluminum- and phosphorus-co-doped silica fibers with low optical losses were fabricated by the MCVD method, utilizing an all-gas-phase deposition technique. Optical and laser properties of the active fibers with a phosphosilicate a

Externí odkaz: https://doaj.org/article/af2e00532e014fd58ddbc987c28e6423

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Akademický článek

Extra-High Pressure in the Core of Silica-Based Optical Fiber Preforms during the Manufacturing Process

Autor: Galina Bufetova, Alexey Kosolapov, Mikhail Yashkov, Andrey Umnikov, Vladimir Velmiskin, Vladimir Tsvetkov, Igor Bufetov

Publikováno v: Photonics, Vol 10, Iss 3, p 335 (2023)

The core refractive index n2 of silica-based optical fiber preform heated to 2000 °C was determined experimentally for the first time. The measurements were carried out in the process of preform temperature reduction. It was shown that n2 could incr

Externí odkaz: https://doaj.org/article/755863eecfc549f890220e2fc98aa60b

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Akademický článek

Random Laser Based on Ytterbium-Doped Fiber with a Bragg Grating Array as the Source of Continuous-Wave 976 nm Wavelength Radiation

Autor: Andrey Rybaltovsky, Sergei Popov, Dmitry Ryakhovskiy, Alexey Abramov, Andrey Umnikov, Oleg Medvedkov, Viktor Voloshin, Alexander Kolosovskii, Igor Vorob’ev, Yuriy Chamorovskiy, Denis Lipatov

Publikováno v: Photonics, Vol 9, Iss 11, p 840 (2022)

A random narrow-linewidth lasing at a wavelength of 976 nm was obtained in an ytterbium-doped germanophosphosilicate fiber with an array of weakly reflecting fiber Bragg gratings (FBGs). A random laser cavity was formed by implementing the standard p

Externí odkaz: https://doaj.org/article/60d6ba120b944d96ab2b368cb8f90c46

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Akademický článek

Double-Clad Bismuth-Doped Fiber with a Rectangular Inner Cladding for Laser Application

Autor: Alexander Vakhrushev, Andrey Umnikov, Sergey Alyshev, Aleksandr Khegai, Elena Firstova, Lyudmila Iskhakova, Aleksei Guryanov, Mikhail Melkumov, Sergei Firstov

Publikováno v: Photonics, Vol 9, Iss 11, p 788 (2022)

In this paper, we report the latest research results on the fabrication of double-clad Bi-doped germanosilicate core fibers with a rectangular inner cladding design for improved laser performance in the near-IR spectral region. Detailed comparative a

Externí odkaz: https://doaj.org/article/1fd3e73323db44ca8de7b42b84f16aff

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Akademický článek

Photosensitive Yb-Doped Germanophosphosilicate Artificial Rayleigh Fibers as a Base of Random Lasers

Autor: Andrey Rybaltovsky, Sergei Popov, Denis Lipatov, Andrey Umnikov, Alexey Abramov, Oleg Morozov, Dmitry Ryakhovskiy, Viktor Voloshin, Alexander Kolosovskii, Igor Vorob’ev, Oleg Butov, Yuriy Chamorovskiy

Publikováno v: Fibers, Vol 9, Iss 9, p 53 (2021)

Asingle-mode Yb-doped germanophosphosilicate fiber with ultra-low optical losses (less than 2 dB/km) was fabricated by means of the MCVD method utilizing an all-gas-phase deposition technique developed “in house”. The absorption and luminescent s

Externí odkaz: https://doaj.org/article/45709a725d8744fc8597e1ab27ed02ec

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Akademický článek

New Catastrophic Gas Blowout and Giant Crater on the Yamal Peninsula in 2020: Results of the Expedition and Data Processing

Autor: Vasily Bogoyavlensky, Igor Bogoyavlensky, Roman Nikonov, Tatiana Kargina, Evgeny Chuvilin, Boris Bukhanov, Andrey Umnikov

Publikováno v: Geosciences, Vol 11, Iss 2, p 71 (2021)

This article describes the results of an Arctic expedition studying the new giant gas blowout crater in the north of Western Siberia, in the central part of the Yamal Peninsula in 2020. It was named C17 in the geoinformation system “Arctic and the

Externí odkaz: https://doaj.org/article/7707d6f2b5bc424c9c2bfea08ca0622f

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