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Light(Science & Applications) 2024年第2期13卷 354-365页

作者： Yaoxiang Liu fukang yin Tie-Jun Wang Yuxin Leng Ruxin Li Zhizhan Xu See Leang Chin State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Centre d’Optique Photonique et Laser(COPL)and Département de physiquede génie physique et d’optiqueUniversitéLavalQuébecQuébecCanada

Supercontinuum(SC)light source has advanced ultrafast laser spectroscopy in condensed matter science,biology,physics,and *** to the frequently used photonic crystal fibers and bulk materials,femtosecond laser filamentation in gases is damage-immune for supercontinuum generation.A bottleneck problem is the strong jitters from filament induced self-heating at kHz repetition rate *** demonstrated stable kHz supercontinuum generation directly in air with multiple mJ level pulse *** was achieved by applying an external DC electric field to the air plasma *** pointing jitters of the 1 kHz air filament induced SC light were reduced by more than 2 *** stabilized high repetition rate laser filament offers the opportunity for stable intense SC generation and its applications in air.

关键词： intense repetition light

Pulse repetition rate effect on the plasma inside femtosecond laser filament in air

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Chinese Optics Letters 2024年第1期22卷 135-140页

作者：尹富康王铁军刘尧香龙娟魏迎霞朱斌周凯南冷雨欣 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyang 621999China

The characteristics of plasmas play an important role in femtosecond laser filament-based *** analysis is used to experimentally investigate the plasma density and its temperature of the air filament under different pulse repetition *** our experiments,the measured average plasma density of the filament is 1.54×10^(17)cm^(-3)and the temperature of the plasma is about 5100 K under 100 Hz pulse repetition *** plasma density decreases to1.43×10^(17)cm^(-3)and the temperature increases to 6230 K as the pulse repetition rate increases to 1000 *** experimental observation agrees with the numerical simulation by solving the nonlinear Schr?dinger equations with repetition rate related“low density hole”correction.

关键词： femtosecond laser filamentation cumulative effects electron density

Verification of a Modified Nonhydrostatic Global Spectral Dynamical Core Based on the Dry-Mass Vertical Coordinate: Three-Dimensional Idealized Test Cases

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Journal of Meteorological Research 2023年第3期37卷 286-306页

作者： Jun PENG Jianping WU Xiangrong YANG Jun ZHAO Weimin ZHANG Jinhui YANG fukang yin College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073

The newly developed nonhydrostatic(NH)global spectral dynamical core is evaluated by using three-dimensional(3D)benchmark tests with/without *** new dynamical core differs from the original Aladin-NH like one in the combined use of a dry-mass vertical coordinate and a new temperature variable,and thus,it inherently conserves the dry air mass and includes the mass sink effect associated with precipitation *** 3D dry benchmark tests are first conducted,including steady state,dry baroclinic waves,mountain waves in non-sheared and sheared background flows,and a dry Held–Suarez *** results from these test cases demonstrate that the present dynamical core is accurate and robust in applications on the sphere,especially for addressing the nonhydrostatic ***,three additional moist test cases are conducted to further explore the improvement of the new dynamical ***,in contrast to the original Aladin-NH like one,the new dynamical core prefers to obtain simulated tropical cyclone with lower pressure,stronger wind speeds,and faster northward movement,which is much closer to the results from the Model for Prediction Across Scales(MPAS),and it also enhances the updrafts and provides enhanced precipitation rate in the tropics,which partially compensates the inefficient vertical transport due to the absence of the deep convection parameterization in the moist Held–Suarez test,thus demonstrating its potential value for full-physics global NH numerical weather prediction application.

关键词： nonhydrostatic global spectral dynamical core idealized tests mountain waves tropical cyclone

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

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高功率激光科学与工程:英文版 2023年第4期11卷 17-24页

作者： fukang yin Juan Long Yaoxiang Liu yingxia Wei Bin Zhu Kainan Zhou Tie-Jun Wang Yuxin Leng Ruxin Li State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyangChina

As intense,ultrashort,kHz-repetition-rate laser systems become commercially available,pulse cumulative effects are critical for laser filament-based *** this work,the pulse repetition-rate effect on femtosecond laser filamentation in air was investigated both numerically and *** pulse repetition-rate effect has negligible influence at the leading edge of the *** intensity enhancement from a high-repetition pulse is observed at the peak and tailing edge of the laser *** the repetition rate of the laser pulses increases from 100 to 1000 Hz,the length of the filament extends and the intensity inside the filament increases.A physical picture based on the pulse repetition-rate dependent‘low-density hole’effect on filamentation is proposed to explain the obtained results well.

关键词： clamping intensity cumulative effects femtosecond laser filamentation

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GSM-R在铁路通信中的作用

中国铁路 2006年第6期 12-14页

作者：尹福康铁道部经济规划研究院技术标准所副所长高级工程师北京100038

GSM-R 是欧洲铁路联盟(UIC)在 TDMA 数字移动通信中引入特殊寻址方式和高级语音呼叫业务而形成的技术体制。铁道部决定采用欧洲 GSM—R作为我国铁路移动通信体制,并根据我国铁路行车密度高、运输组织复杂等特点,引进通用分组无线业务子... 详细信息

GSM-R 是欧洲铁路联盟(UIC)在 TDMA 数字移动通信中引入特殊寻址方式和高级语音呼叫业务而形成的技术体制。铁道部决定采用欧洲 GSM—R作为我国铁路移动通信体制,并根据我国铁路行车密度高、运输组织复杂等特点,引进通用分组无线业务子系统(GPRS),与既有线调度通信系统相结合。GSM-R 能够在一个综合平台上提供丰富的综合调度通信业务,特别是能够为列车控制提供无线数据传输,具有强大的调度功能。

关键词：铁路无线通信数字移动通信调度通信系统 GSM-R

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中国铁路GSM-R技术发展状况

中国铁路 2005年第3期 34-36页

作者：尹福康铁道部运输局基础部处长北京100844

介绍欧洲GSM-R的发展状况以及对我国GSM-R技术发展的影响;阐述中国GSM-R技术发展思路、标准体系及当前进展情况。

关键词：中国铁路建设 GSM-R技术网络标准通信系统

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飞秒激光成丝的衍射分析方法

中国激光 2022年第24期49卷 142-148页

作者：郑恒毅尹富康王铁军刘尧香魏迎霞朱斌周凯南冷雨欣中国科学院上海光学精密机械研究所强场激光物理国家重点实验室上海201800 中国科学院大学材料与光电研究中心北京310027 中国工程物理研究院激光聚变研究中心等离子体物理重点实验室四川绵阳621999

提出了一种用于模拟探测光穿过等离子体通道后衍射成像过程的分段衍射模型,该模型考虑了等离子体对探测光的散焦效应。将分段衍射模型与现有计算模型进行对比,并将模拟结果与基于纵向衍射测量法的实验结果进行拟合,获得了不同衍射环结... 详细信息

提出了一种用于模拟探测光穿过等离子体通道后衍射成像过程的分段衍射模型,该模型考虑了等离子体对探测光的散焦效应。将分段衍射模型与现有计算模型进行对比,并将模拟结果与基于纵向衍射测量法的实验结果进行拟合,获得了不同衍射环结构下的电子密度分布。结果表明:分段衍射模型可以拓展探测范围,实现对较高电子密度等离子体的测量。基于分段衍射模型测量电子密度和光丝尺寸的方法为精确诊断光丝提供了一种新思路。

关键词：非线性光学飞秒激光成丝等离子体诊断衍射理论电子密度

Time-resolved measurements of electron density and plasma diameter of 1 kHz femtosecond laser filament in air

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Chinese Optics Letters 2022年第9期20卷 73-78页

作者：郑恒毅尹富康王铁军刘尧香魏迎霞朱斌周凯南冷雨欣 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyang 621999China

The temporal evolutions of electron density and plasma diameter of 1 kHz femtosecond laser filament in air are experimentally investigated by utilizing a pump-probe longitudinal diffraction method.A model based on scalar diffraction theory is proposed to extract the spatial phase shift of the probe pulse from the diffraction patterns by the laser air plasma *** hydrodynamic effect on plasma evolution at 1 kHz filament is included and *** measured initial peak electron density of~10^(18)cm^(-3) in our experimental conditions decays rapidly by nearly two orders of magnitude within200 ***,the plasma channel size rises from 90μm to 120μm as the delay time *** experimental observation is in agreement with numerical simulation results by solving the rate equations of the charged particles.

关键词： femtosecond laser filamentation electron density diffraction

Solving Linear PDEs with the Aid of Two-Dimensional Legendre Wavelets

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Solving Linear PDEs with the Aid of Two-Dimensional Legendre...

2012 National Conference on Information Technology and Computer Science

作者： fukang yin School of computer National University of defense technology Changsha China Junqiang Song School of computer National University of defense technology Changsha China

In this paper,we develop a method,which using twodimensional Legendre wavelets,to solve linear *** on the properties of shifted Legendre polynomials,we give a brief proof about the general procedure of two-dimensional operational matrices of integration,and then employ aforementioned matrices to find the solution of the *** proposed method is mathematically simple and *** demonstrate the efficiency of the method,two test problems （solution of the diffusion,Poisson） are *** experimental results showed that the accuracy of the method is very high and only need a small number of collocation points.

关键词： two-dimensional Legendre wavelets operational matrix integration PDEs

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加快铁路GSM-R数字移动通信发展

铁道通信信号 2005年第4期41卷 1-4页

作者：尹福康铁道部运输局基础部通信处

在充分研究我国铁路无线通信技术现状及发展方向的基础上, 提出发展GSM-R是实现中国铁路运输指挥手段现代化的重要部分。对今后一个时期GSM-R工程建设工作进行了部署。

关键词： GSM-R 通信发展数字无线通信技术中国铁路运输发展方向建设工作现代化