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Transient breathing dynamics during extinction of dissipative solitons in mode‑locked fiber lasers

Frontiers of Optoelectronics 2024年第1期17卷 9-19页

作者： Zichuan Yuan Si Luo Ke Dai Xiankun Yao Chenning Tao Qiang Ling Yusheng Zhang Zuguang Guan Daru Chen yudong cui Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Optical Information Detection and Display Technology of Zhejiang Zhejiang Normal UniversityJinhua 321004China School of Physics Northwest UniversityXi’an 710127China

The utilization of the dispersive Fourier transformation approach has enabled comprehensive observation of the birth process of dissipative solitons in fiber ***,there is still a dearth of deep understanding regarding the extinction process of dissipative *** this study,we have utilized a combination of experimental and numerical techniques to thoroughly examine the breathing dynamics of dissipative solitons during the extinction process in an Er-doped mode-locked fiber *** results demonstrate that the transient breathing dynamics have a substantial impact on the extinction stage of both steady-state and breathing-state dissipative *** duration of transient breathing exhibits a high degree of sensitivity to variations in pump *** simulations are utilized to produce analogous breathing dynamics within the framework of a model that integrates equations characterizing the population inversion in a mode-locked *** results corroborate the role of Q-switching instability in the onset of breathing ***,these findings offer new possibilities for the advancement of various operational frameworks for ultrafast lasers.

关键词： Breathing soliton Fiber laser Dispersive Fourier transform Q-switched instability

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Revelation of the birth and extinction dynamics of solitons in SWNT-mode-locked fiber lasers

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Photonics Research 2019年第4期7卷 423-430页

作者： yudong cui XUEMING LIU State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Institute for Advanced Interdisciplinary Research Nanjing University of Aeronautics and Astronautics School of Physics and Electronic Science Hunan University of Science and Technology

The dispersive Fourier transform(DFT) technique opens a fascinating pathway to explore ultrafast non-repetitive events and has been employed to study the build-up process of mode-locked lasers. However, the shutting process for the mode-locked fiber laser seems to be beyond the scope of researchers, and the starting dynamics under nearzero dispersion remains unclear. Here, the complete evolution dynamics(from birth to extinction) of the conventional soliton(CS), stretched pulse(SP), and dissipative soliton(DS) are investigated by using the DFT ***, SP, and DS fiber lasers mode locked by single-walled carbon nanotubes(SWNTs) are implemented via engineering the intracavity dispersion map. The relaxation oscillation can always be observed before the formation of stable pulse operation due to the inherent advantage of SWNT, but it exhibits distinct evolution dynamics in the starting and shutting processes. The shutting processes are dependent on the dispersion condition and turn-off time, which is against common sense. Some critical phenomena are also observed, including transient complex spectrum broadening and frequency-shift interaction of SPs and picosecond pulses. These results will further deepen understanding of the mode-locked fiber laser from a real-time point of view and are helpful for laser design and applications.

关键词： dispersive Fourier transform(DFT) fascinating pathway picosecond pulses

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Revealing the behavior of soliton buildup in a mode-locked laser

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Advanced Photonics 2019年第1期1卷 58-71页

作者： Xueming Liu yudong cui Zhejiang University College of Optical Science and EngineeringState Key Laboratory of Modern Optical InstrumentationHangzhouChina Nanjing University of Aeronautics and Astronautics Institute for Advanced Interdisciplinary ResearchNanjingChina Hunan University of Science and Technology School of Physics and Electronic ScienceXiangtanChina

Real-time spectroscopy based on an emerging time-stretch technique can map the spectral information of optical waves into the time domain,opening several fascinating explorations of nonlinear dynamics in mode-locked ***,the self-starting process of mode-locked lasers is quite sensitive to environmental perturbation,which causes the transient behaviors of lasers to deviate from the true buildup process of *** optimize the laser system to improve its stability,which suppresses the Q-switched lasing induced by environmental ***,therefore,demonstrate the first observation of the entire buildup process of solitons in a mode-locked laser,revealing two possible pathways to generate the temporal *** pathway includes the dynamics of raised relaxation oscillation,quasimode-locking stage,spectral beating behavior,and finally the stable single-soliton *** other pathway contains,however,an extra transient bound-state stage before the final single-pulse modelocking ***,we propose a theoretical model to predict the buildup time of solitons,which agrees well with the experimental *** findings can bring real-time insights into ultrafast fiber laser design and optimization,as well as promote the application of fiber laser.

关键词： fiber laser mode-locking self-starting process relaxation oscillation real-time spectroscopy

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Potential application of radiant floor cooling systems for residential buildings in different climate zones

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Building Simulation 2024年第4期17卷 543-560页

作者： Mengying cui Yang Song yudong Mao Kaimin Yang Jiying Liu Zhe Tian School of Thermal Engineering Shandong Jianzhu UniversityJinan250101China School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Lab of Building Environment and Energy of Tianjin Tianjin UniversityTianjin300072China

A radiant floor cooling system(RFCS)is a high-comfort and low energy consumption system suitable for residential *** floor systems usually work with fresh air,and their operating performance is affected by climatic *** and outdoor environmental disturbances and the system’s control strategy affect the indoor thermal comfort and energy efficiency of the ***,a multi-story residential building model was established in this *** system simulation program was used to study the operation dynamics of three control strategies of the RFCS based on the calibrated ***,the performance of the control strategies in five climate zones in China were compared using multi-criteria decision-making in *** results show that control strategy has a negligible effect on condensation risk,but the thermal comfort and economic performance differ for different control *** adaptability of different control strategies varies in different climate zones based on the consideration of multiple *** performance of the direct-ground cooling source system is better in Hot summer and warm winter *** variable air volume control strategy scores higher in Serve cold and Temperate zones,and the hours exceeding thermal comfort account for less than 3%of the total simulation ***,it is suggested to choose the RFCS control strategy for residential buildings according to the climate zone characteristics,to increase the energy *** results provide a reliable reference for implementing RFCSs in residential buildings.

关键词： control strategy radiant floor cooling system residential building energy efficiency climate zones

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无乳链球菌致病性研究进展

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中国畜牧兽医 2024年第3期51卷 1277-1285页

作者：陈晶马骏范钊玮刘慧婷崔玉东黑龙江八一农垦大学生命科学技术学院大庆163319

无乳链球菌(Streptococcus agalactiae)是一种分布广泛的人兽共患性致病菌,通过形成生物膜可在奶牛乳腺中黏附、定植并长期存活,同时增强对宿主免疫防御的抵抗,引起奶牛乳腺感染而发生亚临床型乳腺炎,是全球范围内引起奶牛乳腺炎的最常... 详细信息

无乳链球菌(Streptococcus agalactiae)是一种分布广泛的人兽共患性致病菌,通过形成生物膜可在奶牛乳腺中黏附、定植并长期存活,同时增强对宿主免疫防御的抵抗,引起奶牛乳腺感染而发生亚临床型乳腺炎,是全球范围内引起奶牛乳腺炎的最常见病原体之一,给奶牛养殖业和奶业造成巨大的经济损失。此外,其还可感染骆驼与罗非鱼等多种动物,造成严重的动物福利恶化,且存在人与动物间接传播的可能。无乳链球菌是一种革兰阳性机会致病菌,可在健康成年人的胃肠道及泌尿生殖道中无症状定植,感染新生儿可导致危及生命的败血症及脑膜炎的发生,并常伴有严重的神经系统后遗症。近年来,成人无乳链球菌感染的发病率呈上升趋势,尤其是对孕妇、老年人及免疫力低下的人群具有更高的易感率,可引起皮肤和软组织感染以及更为严重的败血症、脑膜炎和心内膜炎等疾病的发生。尽管使用抗生素治疗可部分缓解症状,但耐药菌株的出现和传播使得抗生素的治疗效果逐步下降,对无乳链球菌感染的控制愈发困难。笔者就无乳链球菌对多种动物及不同人群的致病性进行综述,以期为无乳链球菌的综合防控提供参考。

关键词：无乳链球菌感染致病性

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基于抛物线演化的宽光谱光纤啁啾脉冲放大系统

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光子学报 2022年第11期51卷 124-131页

作者：杜李靳翠红杨直崔玉栋浙江大学光电科学与工程学院现代光学仪器国家重点实验室杭州310027 中国科学院西安光学精密机械研究所西安710119 华中科技大学武汉光电国家研究中心武汉430074

为了满足光纤激光器在宽光谱高能量应用领域的要求,搭建了一种结构紧凑的光纤型宽光谱啁啾脉冲放大系统。将色散管理型锁模激光器产生的高斯型脉冲作为种子源,注入到正色散掺铒光纤放大器中进行自相似放大,脉冲将逐渐演化成抛物线型,此... 详细信息

为了满足光纤激光器在宽光谱高能量应用领域的要求,搭建了一种结构紧凑的光纤型宽光谱啁啾脉冲放大系统。将色散管理型锁模激光器产生的高斯型脉冲作为种子源,注入到正色散掺铒光纤放大器中进行自相似放大,脉冲将逐渐演化成抛物线型,此过程中脉冲的谱宽和能量都迅速增大。随后脉冲经色散补偿光纤的时域展宽,双包层铒镱共掺光纤的功率放大,透射光栅对压缩后实现了高能量的宽光谱输出。并结合理论模拟,优化了激光器的各元件参数,最终在中心波长1 560 nm处实现了光谱宽度为30 nm,平均功率为1.3 W,脉宽为587 fs,重复频率为40.1 MHz的宽光谱高能量激光输出。该激光器结构紧凑,稳定性好,对光学频率梳、光通信等应用领域具有一定研究价值。

关键词：啁啾脉冲放大自相似放大宽光谱掺铒光纤铒镱共掺光纤

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Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

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Friction 2024年第7期12卷 1532-1547页

作者： Zilin LI Lisha DOU Shiyu YANG Huajiang OUYANG Qichen ZHU Xiaoyang CHEN Xin JIA Shuaiwei DOU Xiaolong cui yudong ZHANG Jingjiang QIU Guochen QI Bangbang NIE Pan LIU Ronghan WEI School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Engineering Technology Research Center of Henan Province for MEMS Manufacturing and Application Zhengzhou UniversityZhengzhou 450001China Institute of Intelligent Sensing Zhengzhou UniversityZhengzhou 450001China School of Engineering University of LiverpoolLiverpool L693GHUK School of Cyber Science and Engineering&Hanwei Institute of Internet of Things Zhengzhou UniversityZhengzhou 450001China

Copper,permalloy,cobalt,and silicon are the materials that have been widely utilised in magnetic *** the size of interest is down to the nanoscale,the inter-diffusion between certain materials becomes *** paper studies the nanoscale friction characteristics between frictional pairs with and without inter-diffusion properties through the atomic force *** distinct evolution features of nanoscale friction force when inter-diffusion is involved are discovered experimentally,which is also confirmed through theoretical ***,through the thin film deposition method,four pairs of contact materials(Cu–Ni_(81)Fe_(19),Si–Ni_(81)Fe_(19),Cu–Co,Cu–Si)are designed for friction tests,in which diffusion occurs at the interface of Cu–Ni_(81)Fe_(19)***,the effects of sliding velocity and loading force on the nano friction of each pair are *** is found that regardless of the diffusion phenomenon:(1)the adhesion force values exhibit a notable correlation to the values of the friction force;(2)the friction force in all four material pairs consistently increases with the growth of the normal loading force,although the growth rate may *** terms of the sliding velocity effect,the friction forces of immiscible materials(Si–Ni_(81)Fe_(19),Cu–Co,and Cu–Si)are found to increase with the increasing sliding ***,the friction force of Cu–Ni_(81)Fe_(19),decreases with the increasing sliding ***,a compositive friction model considering both the velocity and the normal force effect was proposed,which shows good agreement with the experimental results and explains the nano friction behaviour of both miscible and immiscible metals.

关键词： atomic force microscope friction force normal load sliding velocity

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超快激光制造技术实验教学平台的建设与探索

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电子科技 2023年第10期36卷 56-61页

作者：云灵崔玉栋南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院江苏南京210023 浙江大学光电科学与工程学院浙江杭州310058

加强实践训练与创新意识培育是高等工程教育不可或缺的组分,在培育创新思维意识的过程中需借助实验教学。考虑到光电信息科学与工程专业在理论技术性方面和实践性方面都有较高的要求,加之理论知识更新速度快,文中设计了超快光纤激光制... 详细信息

加强实践训练与创新意识培育是高等工程教育不可或缺的组分,在培育创新思维意识的过程中需借助实验教学。考虑到光电信息科学与工程专业在理论技术性方面和实践性方面都有较高的要求,加之理论知识更新速度快,文中设计了超快光纤激光制造技术实验教学平台,深入研究了以硫化铅量子点为基础的可饱和吸收体对超快光纤激光器的核心性能参数产生的影响。该综合实验涵盖了材料制备及表征、可饱和吸收体研制、超快激光系统搭建及测试等环节,实验内容层次递进、全面丰富,促使学习者灵活掌握各项知识点,同时可以提升学习者的工程实践与创新能力。

关键词：超快激光制造探测技术硫化铅量子点可饱和吸收体新工科实验教学

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Preliminary Investigation of Impurity and Radiation Behaviors in the Startup Phase of HL-2A Tokamak

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Southwestern Institute of Physics Annual Report 2004年第1期 20-21页

作者： LI Wei PAN yudong cui Zhengying LUO Junlin DONG Jiafu

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羊口疮病毒维持O⁃H感染系统的稳态机制

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病毒学报 2022年第4期38卷 1007-1015页

作者：于永忠张帆杨超群刘圆圆杨晓崔玉东黑龙江八一农垦大学生命科学技术学院分子病毒实验室大庆163319

羊口疮病毒(Orf virus,ORFV)是副痘病毒属(Parapoxvirus,PPV)典型的代表成员,具有鲜明的种属特征。ORFV具有高度的上皮嗜性,并不侵入真皮层,通常导致皮肤或黏膜上皮严重的病理性损伤;并且容易造成继发性感染。近年来,随着ORFV与宿主细... 详细信息

羊口疮病毒(Orf virus,ORFV)是副痘病毒属(Parapoxvirus,PPV)典型的代表成员,具有鲜明的种属特征。ORFV具有高度的上皮嗜性,并不侵入真皮层,通常导致皮肤或黏膜上皮严重的病理性损伤;并且容易造成继发性感染。近年来,随着ORFV与宿主细胞“互作”机制研究的不断深入,病毒进化的细胞策略初露端倪。为了揭示其较为完整的细胞策略,我们借助“ORFV⁃HOST”(O⁃H)系统全方位阐述病毒与宿主建立的互作关系。本综述旨在挖掘病毒感染期间维持O⁃H系统稳态的目的、意义及其分子机制,为丰富ORFV分子病毒学理论和羊口疮抗病毒设计提供了参考。

关键词：羊口疮病毒基因组演化 O⁃H系统感染稳态分子机制

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