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Impact of cavity symmetry on mode suppression and increase of free spectral range in solid-state dye microlaser

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Chinese Optics Letters 2007年第11期5卷 651-653页

作者： Sergei Popov Sebastien Ricciardi Ari T.Friberg sergey sergeyev Royal Institute of Technology Stockholm 16440 Sweden Waterford Institute of Technology Waterford Ireland

We describe modeling the solid-state dye laser with the microcavity size comparable to light wavelength. Certain symmetry in the allocation of gain material leads to depletion of odd longitudinal modes that, in turn, ... 详细信息

关键词： mode Impact of cavity symmetry on mode suppression and increase of free spectral range in solid-state dye microlaser free

Vector harmonic mode-locking by acoustic resonance

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Photonics Research 2021年第8期9卷 1432-1438页

作者： sergey sergeyev STANISLAV KOLPAKOV YURY LOIKA Aston Institute of Photonic Technologies Aston UniversityBirminghamB47ETUK

For an Er-doped fiber laser,for the first time,to the best of our knowledge,we demonstrate both experimentally and theoretically a novel mechanism of harmonic mode-locking based on the electrostriction effect leading to excitation of the torsional acoustic modes in the transverse section of the *** exited torsional acoustic modes modulate the fiber birefringence that results in synchronization of oscillations at the harmonic modes and the linewidth narrowing with the increased signal-to-noise ratio of 30 d *** adjusting the in-cavity birefringence based on tuning the polarization controller,we enable the selection of the harmonic mode to be stabilized.

关键词： fiber polarization tuning

Observation of chaotic polarization attractors from a graphene mode locked soliton fiber laser

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Chinese Optics Letters 2019年第2期17卷 60-64页

作者： Chang Zhao Qianqian Huang Chengbo Mou Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data Science Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Higher College of Technology Aston Institute of Photonic Technologies (AIPT) Aston University

We have demonstrated an all-fiber passively mode locked erbium-doped fiber laser(EDFL) based on graphene–polyvinyl-alcohol film. By watchfully adjusting the polarization controller, two different polarization attractors, including polarization locked vector solitons and a circular attractor, can be observed. This is first time, to the best of our knowledge, to explore the dynamics polarization attractors exhibited by a vector soliton generated from an EDFL based on graphene.

关键词： Observation chaotic polarization

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偏振动态可调耗散孤子光纤激光器实验研究

物理学报 2020年第18期69卷 212-217页

作者：赵畅黄千千黄梓楠戴礼龙 sergeyev sergey Rozhin Aleksey 牟成博上海大学特种光纤与光接入网重点实验室上海先进通信与数据科学研究院特种光纤与先进通信国际合作联合实验室上海200444 阿斯顿大学阿斯顿光子技术研究所伯明翰B47ET

实验搭建了一台基于碳纳米管的耗散孤子光纤激光器,研究了耗散孤子的动态偏振特性.在160 mW的抽运功率下,得到了稳定的单脉冲耗散孤子.通过调整腔内的偏振控制器,得到了庞加莱球上为固定点形式吸引子的偏振锁定矢量耗散孤子.单向机械调... 详细信息

实验搭建了一台基于碳纳米管的耗散孤子光纤激光器,研究了耗散孤子的动态偏振特性.在160 mW的抽运功率下,得到了稳定的单脉冲耗散孤子.通过调整腔内的偏振控制器,得到了庞加莱球上为固定点形式吸引子的偏振锁定矢量耗散孤子.单向机械调节腔内偏振控制器可以调控偏振锁定吸引子向极限环吸引子的演化,且实现极限环区域可控.对比不同偏振吸引子下的偏振度发现,偏振度的高低和偏振吸引子覆盖区域面积成反比.因此,可以通过偏振度的大小定量地判断吸引子是否为偏振锁定.该工作对于研究新型偏振可调激光器、探索激光器的物理机制具有指导意义.

关键词：光纤激光器耗散孤子偏振吸引子

Reactivation of hepatitis B virus infection – an important aspect of multifaceted problem

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World Journal of Gastroenterology 2024年第26期30卷 3193-3197页

作者： sergey Morozov sergey Batskikh Department of Gastroenterology Hepatology and NutritionFederal Research Center of NutritionBiotechnology and Food SafetyMoscow 115446Russia Department of Hepatology Moscow Clinical Scientific Center N.A.A.S.LoginovMoscow 111123Russia

In this editorial we comment on the article published in the recent issue of the W orld Journal of *** focus specifically on the problem of occult hepatitis B virus(HBV)infection,that is a result of previous hepatitis B(PHB)and a source for reactivation of *** prevalence of PHB is underestimated due to the lack of population testing ***,this condition not only com-plicate anticancer treatment,but may be responsible for the development of other diseases,like cancer or autoimmune *** we unveil possible mecha-nisms responsible for realization of these processes and suggest practical approa-ches for diagnosis and treatment.

关键词： Occult hepatitis B virus infection Hepatitis B virus reactivation Previous hepatitis B Cancer Autoimmune disorders

Radiation of a TM mode from an open end of a three-layer dielectric capillary

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Chinese Physics B 2024年第7期33卷 311-318页

作者： sergey NGalyamin Alexandr MAltmark St.Petersburg State University 7/9Universitetskayanab.St.Petersburg 199034Russia St.Petersburg Electrotechnical University“LETI” 5ProfessoraPopovaSt.Petersburg 197022Russia

Modern trends in beam-driven radiation sources include the interaction of Cherenkov wakefields in open-ended circular waveguides with complicated dielectric linings, with a three-layer dielectric capillary recently proposed to reduce radiation divergence being a representative example [Opt. Lett. 45 5416(2020)]. We present a rigorous approach that allows for an analytical description of the electromagnetic processes that occur when the structure is excited by a single waveguide TM mode. In other words, the corresponding canonical waveguide diffraction problem is solved in a rigorous formulation. This is a continuation of our previous papers which considered simpler cases with a homogeneous or two-layer dielectric filling. Here we use the same analytical approach based on the Wiener–Hopf–Fock technique and deal with the more complicated case of a three-layer dielectric lining. Using the obtained rigorous solution, we discuss the possibility of manipulating the far-field radiation pattern using a third layer made of a low permittivity material.

关键词： diffraction radiation open-ended waveguide Wiener–Hopf technique Cherenkov radiation

A Note on Transition Kernels for the Most UnfavourableMixed Strategies of the Market

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Journal of the Operations Research Society of China 2024年第1期12卷 35-50页

作者： sergey N.Smirnov Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State UniversityMoscowRussian Federation 119991

We consider a deterministic model of market evolution with trading constraints andapply a game-theoretic approach to the superhedging *** obtain sufﬁcientconditions for the game equilibrium and prove under these conditions the existenceof a Borel-measurable transition kernel describing dependence on price prehistory ofthe most unfavourable mixed strategy of the market.

关键词： Superhedging Guaranteed deterministic approach Optimal mixedstrategies of the market Borel-measurable transition kernel Game equilibrium

Structural Stability of the Financial Market Model: Continuity of Superhedging Price and Model Approximation

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Journal of the Operations Research Society of China 2024年第1期12卷 215-241页

作者： sergey N.Smirnov Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State UniversityMoscow119991Russian Federation

The present paper continues the topic of our recent paper in the same journal,aiming to show the role of structural stability in financial *** the context of financial market modeling,structural stability means that a specific“no-arbitrage”property is unaffected by small(with respect to the Pompeiu–Hausdorff metric)perturbations of the model’s *** formulate,based on our economic interpretation,a new requirement concerning“no arbitrage”properties,which we call the“uncertainty principle”.This principle in the case of no-trading constraints is equivalent to structural *** demonstrate that structural stability is essential for a correct model approximation(which is used in our numerical method for superhedging price computation).We also show that structural stability is important for the continuity of superhedging prices and discuss the sufficient conditions for this continuity.

关键词： Uncertainty Structural stability No arbitrage Continuity of superhedging price Compact-valued multifunction Financial market model approximation Trading constraints

Unveiling the early universe:Axion-like particles and their role in primordial structure formation

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 178-179页

作者： sergey G.Rubin National Research Nuclear University MEPhI(Moscow Engineering Physics Institute) Moscow 115409Russia

The groundbreaking discovery of gravitational waves(GWs)by the LIGO-VIRGO-KAGRO collaboration has revolutionized our understanding of the universe and opened up a new way of observing cosmic events. Unlike light waves... 详细信息

关键词： universe gravitational cosmic