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Journal of Rare Earths 2018年第10期36卷 1030-1035页

作者： Yabin Cao Fan Wang Chongyun Shao yu yue Lili Hu chunlei yu Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China

To exhibit large emission cross sections of Nd in silica glass, Nd surroundings were regulated in AI/P codoped silica glass prepared by our multi-step method. The influence of an equimolar amount of AI and P on spectroscopic properties was studied under the local phosphorus coordination environment of *** uniformity of composition distribution was characterized by energy dispersion spectra（EDS） and the coordination environment of Nd ions was characterized by the electron paramagnetic resonance（EPR）spectra. The results indicate that the composition distribution is of high uniformity and Nd has a stronger interaction with P atoms than AI atoms regardless of Al/P molar ratio. Local phosphorus coordination environment of Nd ions in silica glass is achieved. Large σ（em） can be achieved when Al or P is excessive,and larger σ（em） is more likely achieved when P is much more than Al. This work brings new possibilities for obtaining large stimulated cross sections of Nd in silica glass.

关键词： Al/P co-doped silica glass Nd Multi-step method EPR Rare earths

Balancing Magnetic and Mechanical Properties of Non-oriented Electrical Steel: Correlation Between Microstructure and Properties

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ACTA METALLURGICA SINICA-ENGLISH LETTERS 2024年第12期37卷 2136-2149页

作者： Cheng, Zhaoyang Liu, Jing yu, chunlei Zhong, Bolin Chen, Shenglin Fu, Bing Birosca, Soran Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Peoples R China Shenzhen Univ Coll Mat Sci & Engn Guangdong Prov Key Lab New Energy Mat Serv Safety Shenzhen 518060 Peoples R China Wuhan Univ Sci & Technol Hubei Engn Technol Res Ctr Marine Mat & Serv Safet Wuhan 430081 Peoples R China Wuhan Iron & Steel Co Ltd R&D Ctr Wuhan 430080 Peoples R China Univ Portsmouth Fac Technol Sch Mech & Design Engn Portsmouth PO1 3DJ England

High performance e-motors require a continuous enhancement of physical and mechanical properties for non-oriented electrical steel (NOES). However, the optimization of mechanical and magnetic properties simultaneously during NOES processing is extremely challenging where both properties directly influenced by alloy grain size, crystallographic texture, and dislocation density. In the current investigation, recrystallization annealing cycles were employed to modify the microstructure with the aim of balance magnetic and mechanical properties of NOES concurrently. The results showed that with increasing annealing temperatures, the degree of recrystallization and grain size increased, while the dislocation density reduced considerably at the early stage of recrystallization. Meanwhile, the values of texture parameter Aoverall & lowast;\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$A_{{{\text{overall}}}}{*}$$\end{document} (which is a function of overall individual grain orientations and their alignments with easy magnetization directions) were increased. It was evident that the magnetic properties were significantly improved, however the alloy strength was reduced with increasing annealing temperatures. Here, the correlation between magnetic properties as well as alloy strength on grain size, texture, and dislocation density were determined. From crystallographic texture intensity and measured properties quantitative analyses it was concluded that grain size was the predominant factor in balancing the mechanical and magnetic properties of the studied steel. Furthermore, the optimal comprehensive properties (both magnetic and mechanical) were achieved by annealing at 800 degrees C, which yielded a magnetic induction B5000 of 1.616 T, a high-frequency iron loss P1.0/400 of 22.43 W/kg, and

关键词： High strength non-oriented silicon steel Microstructure Texture Magnetic properties Mechanical properties

The effect of OH^(-) groups on the spectroscopic properties of erbium-doped tellurite glasses

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Science China(Technological Sciences) 2005年第6期48卷 638-647页

作者： yu chunlei DAI Shixun ZHOU Gang ZHANG Junjie HU Lili JIANG Zhonghong Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Graduate School of the Chinese Academy of Sciences Beijing 100049China

A series of five different concentration erbium-doped tellurite glasses with various hydroxl groups were prepared. Infrared spectra of glasses were measured. In order to estimate the exact content of OH? groups in samples, various absorption coefficients of the OH? vibration band were analyzed under the different oxygen bubbling times. The absorption spectra of the glasses were measured, and the Judd-Ofelt intensity parameters Ω i of samples with the different erbium ions concentration and OH? contents were calculated on the basis of the Judd-Ofelt theory. The peak stimulated emission cross-section of 4|13/2→4|15/2 transition of the samples was finally calculated by using the McCumber theory. The fluorescence spectra of Er3+:4|13/2→4|15/2 transition and the lifetime of Er3+:4|13/2 level of the samples were measured. The effects of OH? groups on the spectroscopic properties of Er3+ doped samples with the different concentrations were discussed. The results showed that the OH? groups had great influences on the Er3+ lifetime and the fluorescence peak intensity. The OH? group is a main influence factor of fluorescence quenching when the doping concentration of Er2O3 is smaller than 1.0 mol%, but higher after this concentration, the energy transfer of Er3+ ions turns into the main function of the fluorescence quenching. And basically, there is no influence on the other spectroscopic properties (FWHM, absorption spectra, peak stimulated emission cross section, etc.).

关键词： OH^(-)groups tellurite glasses erbium ions spectroscopic properties

Intelligent and connected vehicles： Current status and future perspectives

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Science China(Technological Sciences) 2018年第10期61卷 1446-1471页

作者： YANG DianGe JIANG Kun ZHAO Ding yu chunlei CAO Zhong XIE ShiChao XIAO ZhongYang JIAO Xinyu WANG SiJia ZHANG Kai State Key Laboratory of Automotive Safety and Energy Department of Automotive Engineering Collaborative Innovation Center of Intelligent New Energy Vehicle Tsinghua University Beijing 100084 China University of Michigan Transportation Research Institute Ann Arbor MI 48109 USA

Intelligent connected vehicles(ICVs) are believed to change people's life in the near future by making the transportation safer,cleaner and more comfortable. Although many prototypes of ICVs have been developed to prove the concept of autonomous driving and the feasibility of improving traffic efficiency, there still exists a significant gap before achieving mass production of high-level ICVs. The objective of this study is to present an overview of both the state of the art and future perspectives of key technologies that are needed for future ICVs. It is a challenging task to review all related works and predict their future perspectives, especially for such a complex and interdisciplinary area of research. This article is organized to overview the ICV key technologies by answering three questions: what are the milestones in the history of ICVs; what are the electronic components needed for building an ICV platform; and what are the essential algorithms to enable intelligent driving? To answer the first question, the article has reviewed the history and the development milestones of ICVs. For the second question, the recent technology advances in electrical/electronic architecture, sensors, and actuators are presented. For the third question, the article focuses on the algorithms in decision making, as the perception and control algorithm are covered in the development of sensors and actuators. To achieve correct decision-making, there exist two different approaches: the principle-based approach and data-driven approach. The advantages and limitations of both approaches are explained and analyzed. Currently automotive engineers are concerned more with the vehicle platform technology, whereas the academic researchers prefer to focus on theoretical algorithms. However, only by incorporating elements from both worlds can we accelerate the production of high-level ICVs.

关键词： intelligent connected vehicle (ICV) autonomous driving artificial intelligence advanced driver assistance systems(ADAS) electrical/electronic architecture (EEA) environmental perception decision-making ICV computation platform

Transmission Properties of a New Glass Ceramic and Doped with Co^(2+) as Saturable Absorber for 1.54 μm Er Glass Short Pulse Laser

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 54-57页

作者： yu chunlei CHEN Li FENG Suya HE Dongbing WANG Meng HU Lili Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

The preparation and characteristics of a new transparent glass ceramic were described. Crystal phase particles with nanometer size were successfully precipitated in glass matrix, which was confirmed to be one of indium aluminum zinc oxide compounds （InxAlrZn2O）. The presence of aluminum （A1） and indium （In） impurities in the zinc oxides （ZnO） crystal lattice leads to some changes of the carrier concentration in the material and then promote the sharply changes of transmission spectra in IR range wavelength. And subsequently, the IR cut-off edge blue shifted from 5.5 pm in base glass to 3 μm in transparent glass ceramic sample. Furthermore, passive Q switched 1.54 ktm Er glass laser pulses with pulse energy of 10 mJ and pulse width of 800 ns were successfully obtained by using the cobalt doped transparent glass ceramic as a saturable absorber.

关键词： glass-ceramics infrared transmission Co2+ doped saturable absorber Er glass laser

2 μm mode-locking laser performances of sol-gel-fabricated large-core Tm-doped silica fiber

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Chinese Optics Letters 2018年第2期16卷 122-126页

作者： Yan Ren Zhipeng Qin Guoqiang Xie Zhen Qiao Ting Hal Peng yuan Jingui Ma Liejia Qian Shikai Wang chunlei yu Lili Hu Key Laboratory for Laser Plasmas of the Ministry of Education Collaborative Innovation Center of IFSA(CICIFSA)School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

High-power ultrafast fiber lasers operating at the 2μm wavelength are extremely desirable for material processing,laser surgery,and nonlinear *** we fabricated large-core(LC)double-cladding Tm-doped silica fiber via the sol-gel *** sol-gel-fabricated Tm-doped silica(SGTS)fiber had a large core diameter of 30μm with a high refractive index homogeneity(Δn=2×10^(-4)).With the newly developed LC SGTS fiber as the gain fiber,high-power mode-locking was *** using a semiconductor saturable absorber mirror(SESAM)as a mode locker,the LC SGTS fiber oscillator generated mode-locked pulses with an average output power as high as 1.0 W and a pulse duration of 23.9 ps at the wavelength of 1955.0 *** research results show that the self-developed LC Tm-doped silica fiber via the sol-gel method is a promising gain fiber for generating high-power ultrafast lasers in the 2μm spectral region.

关键词： High power fiber lasers High power lasers Laser surgery Materials processing Semiconductor saturable absorber mirrors Silica fibers

6 - 13 Development and Research of Machine Protection System with PLC Redundancy based on EPICS

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IMP & HIRFL Annual Report 2012年第1期 254-255页

作者： yu chunlei Guo yuhui Jiang Ziyun Liu Haitao Hu Jianjun Zheng Yawei yu Zemin

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上海软X射线自由电子激光装置联锁保护系统

原子能科学技术 2018年第4期52卷 756-761页

作者：于春蕾赵欢丁建国中国科学院上海应用物理研究所上海201800

为快速准确地对加速器关键设备提供有效保护,避免关键部件损坏,上海软X射线自由电子激光装置需搭建一套可靠的联锁保护系统。该联锁系统使用分布式架构,并采用可编程逻辑控制器(PLC)和实验物理与工业控制系统(EPICS)进行设计。为满足加... 详细信息

为快速准确地对加速器关键设备提供有效保护,避免关键部件损坏,上海软X射线自由电子激光装置需搭建一套可靠的联锁保护系统。该联锁系统使用分布式架构,并采用可编程逻辑控制器(PLC)和实验物理与工业控制系统(EPICS)进行设计。为满足加速器不同的调试和运行需求,使用Master主站+本地子站的设计策略,最终设计并实现了运行模式管理和切换的功能。系统的所有功能已在设备运行中得到了检验,有效保证了加速器的安全运行。

关键词：联锁保护系统可编程逻辑控制器模式控制实验物理与工业控制系统主站点

高功率激光运转条件下大模场掺镱石英光纤模式特性的仿真研究

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光学学报 2022年第10期42卷 107-114页

作者：沈超超于飞于春雷胡丽丽中国科学院上海光学精密机械研究所高功率激光单元技术实验室上海201800 国科大杭州高等研究院物理与光电工程学院浙江杭州310024

在高功率激光运转条件下,掺杂稀土离子的量子亏损和玻璃材料的本征吸收均会造成光纤放大器中增益光纤温度的整体上升与梯度分布。在热平衡状态下,光纤材料的热光效应将会诱导光纤横向折射率的再分布,引发高功率激光运转条件下增益光纤... 详细信息

在高功率激光运转条件下,掺杂稀土离子的量子亏损和玻璃材料的本征吸收均会造成光纤放大器中增益光纤温度的整体上升与梯度分布。在热平衡状态下,光纤材料的热光效应将会诱导光纤横向折射率的再分布,引发高功率激光运转条件下增益光纤模式特性的改变。为此,利用多物理场有限元建模的数值计算方法对高功率激光运转条件下大模场掺镱石英光纤的热致模式特性展开系统研究,分析总结大模场增益光纤的模式特性在不同激光运转功率、增益光纤设计参数(纤芯直径、数值孔径、热光系数)和光纤弯曲使用条件下的变化规律。结果表明,随着激光运转功率的增加,纤芯和包层之间的温差会变大,从而导致光纤的归一化参数V值增大,最终使模式的传输损耗系数减小,模式在纤芯区域的功率因子增大。

关键词：激光光学大功率激光光纤放大器有限元仿真大模场掺镱石英光纤模式特性热光效应

Large-mode-area neodymium-doped all-solid double-cladding silicate photonic bandgap fiber with an index step of ～0.5%

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Chinese Optics Letters 2018年第8期16卷 21-24页

作者： Meng Li Longfei Wang Shuai Han chunlei yu Danping Chen Wei Chen Lili Hu Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine Mechanics Chinaese Academy of Sciences Shanghai 201800 China University of Chinaese Academy of Sciences Beijing 100049 China

A large-mode-area neodymium-doped silicate photonic bandgap fiber was theoretically designed and experimen- tMly demonstrated. The relative index step between the high-index rods and the background glass was -0.5%, which is the lowest cladding index difference reported on rare-earth-doped all-solid photonic bandgap fibers to our knowledge. An output power of 3.6 W with a slope efficiency of 31- was obtained for a 100-cm-long fiber.

关键词： Large-mode-area neodymium-doped all-solid double-cladding silicate photonic bandgap fiber with an index step of