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Three-level all-fiber laser at 915 nm based on polarization-maintaining Nd^3+-doped silica fiber

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Chinese Optics Letters 2020年第1期18卷 40-43页

作者： Yafei Wang Xingyu Li Jiamin Wu Xiulin Peng Jiangkun Cao Changsheng yang Shanhui Xu zhongmin yang Mingying Pen State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Materials Science and TechnologySouth China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research and Development Center of High-performance Fiber Laser Techniques and Equipments Zhuhai 519031China

Nd3+-doped fiber lasers at around 900 nm based on the 4F3/2→4I9/2 transition have obtained much research attention since they can be used as the laser sources for generating pure blue fiber lasers through the frequency ***,an all-fiber laser at 915 nm was realized by polarization-maintaining Nd3+-doped silica fiber.A net gain per unit length of up to 1.0 dB/cm at 915 nm was obtained from a 4.5 cm fiber,which to our best knowledge is the highest gain coefficient reported in this kind of silica *** optical-to-optical conversion efficiency varies with the active fiber length and the reflectivity of the output fiber Bragg grating(FBG),presenting an optimal value of 5.3%at 5.1 cm fiber length and 70%reflectivity of the low reflection ***,the linear distributed Bragg reflector short cavity was constructed to explore its potential in realizing single-frequency 915 nm fiber *** measurement result of longitudinal-mode properties shows it is still multi-longitudinal mode laser operation with 40 mm laser *** results indicate that the Nd3+-doped silica fiber could be used to realize all-fiber laser at 915 nm,which presents potential to be the seed source of high-power fiber laser.

关键词： fiber laser laser materials neodymium

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分布式光纤在隧洞变形监测中的应用

铁道建筑 2021年第4期61卷 75-78页

作者：杨忠民中国铁道科学研究院集团有限公司北京100081 中国铁道科学研究院集团有限公司铁道建筑研究所北京100081

为监测隧洞衬砌的变形,进而分析隧洞所处滑坡体的稳定性,依据分布式光纤传感技术的特点,从仪器设备、布设工艺、数据采集分析等方面提出了隧洞变形监测技术方案。现场应用结果表明:分布式光纤微应变监测效果良好,能很好地反映隧洞变形状... 详细信息

为监测隧洞衬砌的变形,进而分析隧洞所处滑坡体的稳定性,依据分布式光纤传感技术的特点,从仪器设备、布设工艺、数据采集分析等方面提出了隧洞变形监测技术方案。现场应用结果表明:分布式光纤微应变监测效果良好,能很好地反映隧洞变形状态;监测结果与现场变形迹象有较高的吻合度,该方法有效性较高;所监测隧洞衬砌及底板部分位置微应变值较大,说明滑坡体仍处于变形状态。该研究可为后期隧洞变形监测及滑坡稳定性分析提供技术参考。

关键词：隧洞分布式光纤现场应用滑坡变形监测微应变

我国可再生能源技术专利、碳排放与经济增长的关系研究——基于VAR模型的实证分析

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科技管理研究 2012年第9期32卷 22-26,67页

作者：杨忠敏河北师范大学商学院河北石家庄050024

应用向量自回归(VAR)模型,对我国可再生能源技术专利、CO2排放与GDP之间的动态关系进行实证分析。结果发现,我国可再生能源技术专利、CO2排放与GDP之间存在长期关系,可再生能源技术专利的增加并没有降低CO2排放,GDP的增加导致CO2排放量... 详细信息

应用向量自回归(VAR)模型,对我国可再生能源技术专利、CO2排放与GDP之间的动态关系进行实证分析。结果发现,我国可再生能源技术专利、CO2排放与GDP之间存在长期关系,可再生能源技术专利的增加并没有降低CO2排放,GDP的增加导致CO2排放量的上升。

关键词：可再生能源技术专利碳排放 GDP VAR模型

Correction:Multi-functional bismuth-doped bioglasses:combining bioactivity and photothermal response for bone tumor treatment and tissue repair

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Light(Science & Applications) 2019年第1期8卷 678-679页

作者： Liping Wang Nicholas JLong Lihua Li Yao Lu Mei Li Jiangkun Cao Yu Zhang Qinyuan Zhang Shanhui Xu zhongmin yang Chuanbin Mao Mingying Peng The State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of Technology510641 GuangzhouChina Department of Chemistry Imperial College LondonSouth KensingtonLondon SW72AZUK Guangdong Key Lab of Orthopedic Technology and Implant Materials Department of OrthopedicsGuangzhou General Hospital of Guangzhou Military Command111 Liuhua Road510010 GuangzhouChina Department of Chemistry and Biochemistry Stephenson Life Sciences Research Center University of OklahomaNormanOK 73072USA

In this originally published article,we have noticed several *** should be corrected as follows:*** page 1,the second affiliation(No.5)of the author“Chuanbin Mao”should be deleted as he does not belong to that ***,he should be only listed with(Department of Chemistry and Biochemistry Stephenson Life Sciences Research Center,University of Oklahoma,Norman,OK 73072,USA).

关键词： glasses bismuth listed

Effects of the conversion of natural tropical rainforest to monoculture rubber plantations on soil hydrological processes

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Journal of Plant Ecology 2024年第2期17卷 122-133页

作者： Qiaoyan Chen Ruiyu Fu Siyuan Cheng Dong Qiao zhongmin Hu Zijia Zhang Licong Dai Hainan Baoting Tropical Rainforest Ecosystem Observation and Research Station School of Ecology and EnvironmentHainan UniversityHaikou 570228China Center for Eco-Environment Restoration Engineering of Hainan Province Hainan UniversityHaikou 570228China Hainan Ecological Environment Monitoring Center Haikou 570100China

Rubber plantations have increased signifcantly under unprecedented economic growth in tropical areas,which leads to soil degradation and thereby alters soil hydrological ***,our understanding of how forest conversion affects soil hydrological processes remains ***,we collected soil samples from secondary forests(SF)and rubber plantations(RP)to determine the soil hydrological *** found the topsoil(0-20 cm)water retention in SF was higher than that of RP but displayed the contrast pattern in a deeper soil layer(20-60 cm).Meanwhile,the soil infltration rates among the two vegetation types decreased signifcantly with infltration time,with higher stable soil infltration rates in SF than those in ***,soil properties were also impacted by the forest conversion,such as the topsoil capillary porosity(CP)and total porosity(TP)in SF were higher than those of RP but contrasted in a deep soil *** comparison,the topsoil bulk density(BD)in SF was lower than that of RP,but contrasted in the deep soil layer and reached a signifcant level in the 0-10 and 40-50 cm(P<0.05).Overall,the soil water retention was mainly determined by the CP,which could explain 31.56%of the total variance in soil water retention,followed by TP(26.57%)and soil BD(26.47%),whereas soil texture exerts a weak effect on soil water ***,we can conclude that the conversion of tropical rainforest into rubber plantations may accelerate soil erosion owing to its lower topsoil water retention and soil infltration rates.

关键词： soil water retention soil infltration soil physicochemical properties rubber plantations secondary forest

Nonlinear chirped pulse amplification for a 100-W-class GHz femtosecond all-fiber laser system at 1.5μm

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High Power Laser Science and Engineering 2023年第4期11卷 55-65页

作者： Yiheng Fan Hao Xiu Wei Lin Xuewen Chen Xu Hu Wenlong Wang Junpeng Wen Hao Tian Molei Hao Chiyi Wei Luyi Wang Xiaoming Wei zhongmin yang School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouChina Research Institute of Future Technology South China Normal UniversityGuangzhouChina

In this work,we present a high-power,high-repetition-rate,all-fiber femtosecond laser system operating at 1.5μ*** all-fiber laser system can deliver femtosecond pulses at a fundamental repetition rate of 10.6 GHz with an average output power of 106.4 W–the highest average power reported so far from an all-fiber femtosecond laser at 1.5μm,to the best of our *** utilizing the soliton-effect-based pulse compression effect with optimized pre-chirping dispersion,the amplified pulses are compressed to 239 fs in an all-fiber *** by such a high-power ultrafast fiber laser system,we further explore the nonlinear interaction among transverse modes LP01,LP11 and LP21 that are expected to potentially exist in fiber laser systems using large-mode-area *** intermodal modulational instability is theoretically investigated and subsequently identified in our *** a high-power all-fiber ultrafast laser without bulky free-space optics is anticipated to be a promising laser source for applications that specifically require compact and robust operation.

关键词： high-power femtosecond fiber laser high repetition rate intermodal modulational instability nonlinear pulse compression

重金属氧化物对Er^(3+)掺杂锗碲酸盐玻璃荧光性能的影响

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硅酸盐学报 2005年第6期33卷 732-735页

作者：杨中民张勤远姜中宏华南理工大学光通信材料研究所

在980nm激光二极管的抽运下,对稀土Er3+掺杂锗碲玻璃的荧光性能进行了研究。结果表明:当Bi2O3取代PbO后,玻璃的最大吸收截面和最大发射截面保持不变,而1.53μm荧光带宽略微增大。玻璃的Raman散射光谱显示:这种玻璃的网络局域结构发生了... 详细信息

在980nm激光二极管的抽运下,对稀土Er3+掺杂锗碲玻璃的荧光性能进行了研究。结果表明:当Bi2O3取代PbO后,玻璃的最大吸收截面和最大发射截面保持不变,而1.53μm荧光带宽略微增大。玻璃的Raman散射光谱显示:这种玻璃的网络局域结构发生了变化。Er3+周围局域晶体场的不均匀分布引起了荧光带宽和发射截面带宽的略微增大。

关键词：荧光玻璃铒离子

A new metal-organic rotaxane framework for enhanced ion conductivity of solid-state electrolyte in lithium-metal batteries

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Chinese Chemical Letters 2024年第9期35卷 481-485页

作者： Ying Li Yanjun Xu Xingqi Han Di Han Xuesong Wu Xinlong Wang zhongmin Su School of Marine Science and Engineering Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyJilin Provincial Science and Technology Innovation Center of Optical Materials and ChemistryJilin Provincial International Joint Research Center of Photo-functional Materials and ChemistryChangchun 130022China State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchun 130021China

The composite polymer electrolyte has been obtained via incorporating LiCUST-701(a new metal–organic rotaxane framework modified by Li+)into poly(ethylene oxide)(PEO)matrix and give a high ionic conductivity of 4.02×10^(−4)S/cm at 60℃.DFT calculations were used to visualize the possible diffusion pathway of Li+.The all-solid-state cell assembled with LiFePO_(4),composite polymer electrolyte and lithium metal foil delivered with excellent cycling capability and stability even under high current densities.

关键词： Cucurbiturils Metal-organic rotaxane frameworks Ionic conduction Solid-state electrolyte Lithium-metal batteries

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自然法,还是法律实证主义

环球法律评论 2007年第1期29卷 12-20页

作者：杨忠民程华中国人民公安大学

“恶法非法”还是“恶法亦法”?自然法理论与法律实证主义所争议的这一核心问题既是学术的,又更在学术之外。在学术的象牙塔里,争论还会继续下去,如果仅此而已,社会可以对它们漠然处之。问题在于,当它们中的一个在事实上成为法律实践的... 详细信息

“恶法非法”还是“恶法亦法”?自然法理论与法律实证主义所争议的这一核心问题既是学术的,又更在学术之外。在学术的象牙塔里,争论还会继续下去,如果仅此而已,社会可以对它们漠然处之。问题在于,当它们中的一个在事实上成为法律实践的指导理论时,处于法律生活中的人们就无法不对其投以关注。如何克服法律之恶,应当是现代法律制度建设最重要的问题之一。一个能够保证在现实的立法中,以最大可能追求善,而一旦出现恶法时,又以最大的可能祛除恶,对法律进行修复的制度,必须是我们时刻追求的。

关键词：自然法法律实证主义现代法律制度建设立法