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Approach to the Theoretical Strength of Ti—Ni—Cu Alloy Nanocrystals by Grain Boundary Design

Journal of Materials Science & Technology 2015年第1期31卷 91-96页

作者： Alexandr M.Glezer Nadezhda A.Shurygina Elena N.Blinova Inga E.Permyakova sergey a.firstov Bardin Central Research Institute for the Iron and Steel Industry Vtoraya Baumanskaya ul.9/23Moscow 105005Russia Moscow State University of Instrumental Engineering and Information Science(MGUPI) Moscow 107996Russia National University of Science and Technology(MISIS) Moscow 119049Russia Frantsevich Institute of Materials Science Problems National Academy of Sciences of Ukraineul.Krzhizhanovskogo 3Kiev03680Ukraine

The grain boundary design was used to introduce boride Ti2B and TiB2nanoparticles of 5 nm in size into grain boundaries of nanocrystalline *** a result,the maximum normalized microhardness was increased by 20%and the theoretical limit of hardness is substantially *** is proposed that boride nanoparticles suppressed low-temperature grain-boundary sliding and,therefore,shifted the range of the anomalous behavior of Hall-Petch relation toward smaller sizes of the Ti-Ni-Cu nanocrystals.

关键词： Electron microscopy Microhardness Nanocrystal Nano

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Impact of doping profiles on the formation of laser-active centers in bismuth-doped GeO_(2)–SiO_(2)glass fibers

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Photonics Research 2024年第2期12卷 260-270页

作者： sergey ALYSHEV ALEXANDER VAKHRUSHEV ALEKSANDR KHEGAI ELENa.firstovA KONSTANTIN RIUMKIN MIKHAIL MELKUMOV LYUDMILA ISKHAKOVA ANDREY UMNIKOV SERGEI firstov Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center119333 MoscowRussia Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences 603951 Nizhny NovgorodRussia

Multi-wavelength-band transmission technology based on the exploitation of the extended spectral region is considered as a potential approach to increase the transmission capacity in the deployed fiber-optic communication *** development of optical amplifiers operating in the O-,E-,S-,and U-telecom bands is an extremely important challenge for the successful implementation of this ***-doped fibers are of increasing interest as gain materials,which can be used to provide broadband amplification in the mentioned telecom *** is due to the ability of Bi ions incorporated into glass network to form bismuth active centers(BACs)with specific optical properties,which are primarily determined by the glass *** this work,the impact of the doping profiles of both Ge atoms as glass modifiers and Bi ions on the BACs formation is studied using a series of bismuth-doped fibers fabricated by the modified chemical vapor deposition(MCVD)*** Bi-to-BACs conversion efficiency in various spatial regions of the studied samples is *** is turned out that for high-Bi concentration regions,the conversion efficiency is very low(less than 10%).In addition,the relationship of the conversion efficiency to the distribution of Bi ions and/or Ge atoms is ***,a continuous-wave laser at 1.46μm with a record slope efficiency of 80%is demonstrated using a Bi-doped fiber with confined doping profile,where the Bi-to-BACs conversion efficiency is 35%.This paper provides new information which might help to facilitate understanding of the features of Bi-doped fibers and their potentially achievable characteristics.

关键词： fiber fibers bismuth

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Generation of 1.3/1.4μm random fiber laser by bismuth-doped phosphosilicate fiber

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中国光学快报:英文版 2023年第7期21卷 35-38页

作者：王航贾文成姚永嘉杨欣芸 Mikhail Melkumov sergey firstov Alexey Lobanov 董志鹏罗正钱 Fujian Key Laboratory of Ultrafast Laser Technology and Applications School of Electronic Science and EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Prokhorov General Physics Institute Dianov Fiber Optics Research CenterRussian Academy of SciencesMoscow 119333Russia Devyatykh Institute of Chemistry of High-Purity Substances Russian Academy of SciencesNizhny Novgorod 603951Russia

We have successfully generated a 1.3/1.4μm random fiber laser(RFL)using bismuth(Bi)-doped phosphosilicate *** Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34%over 1 h at a maximum output power of 549.30 mW,with a slope efficiency of approximately 29.21%.The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57μm,indicating that it can be tuned within this ***,we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4μm,achieved through the using of a fiber Bragg grating or a tunable *** to traditional laser sources,the RFL reduces the speckle contrast of images by 11.16%.Due to its high stability,compact size,and high efficiency,this RFL is highly promising for use in biomedical imaging,communication,and sensor applications.

关键词： random fiber laser bismuth-doped fiber wavelength tuning fiber laser

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