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波分复用技术与智能光网络的发展
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作者 陈云志 成煊 《通信世界》 2001年第9期26-27,32,共3页
关键词 掺铒光纤放大器 EDFA 等光子技术 波分复用 WDM 网络管理 智能光网络
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Numerical Investigations of Transverse Gradient Undulator Based on Novel Light Sources
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作者 Tong Zhang Guanglei Wang +7 位作者 Haifeng Yao Dong Wang Wentao Wang Cheng Wang Zhinan Zeng Jiansheng Liu Jiuqing Wang Shuhong Wang 《Journal of Mechanics Engineering and Automation》 2014年第7期610-615,共6页
With the stat-of-the-art laser technique, the quality of electron beam generated from LPA (laser-plasma accelerator) is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current... With the stat-of-the-art laser technique, the quality of electron beam generated from LPA (laser-plasma accelerator) is now becoming much better. The natural merits of electron beam from LPA, e.g., high peak current, ultra-low emittance and ultra-short bunch length, etc., pave the way to the novel light sources, especially in the realm of developing much more compact x-ray light sources, e.g., table-top XFEL (x-ray free-electron laser). However, the radiation power is limited by the rather larger energy spread than conventional radio-frequency electron LINAC (linear accelerator). Luckily, much more power could be extracted by using the undulator with transverse gradient when energy spread effect could be compensated. In this paper, we introduce a novel soit x-ray light source driven by LPA together with TGU (transverse gradient undulator) technique, meanwhile we present a simple idea on how to achieve much higher rep-rate (e.g., -100 kHz) FELs (free-electron lasers) boosted by TGU based on storage rings. 展开更多
关键词 FEL TGU LPA
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Numerical Study of Surface Plasmons Nano-Optical Antenna and Its Array
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作者 郭宝山 宋国锋 陈良惠 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第12期2340-2345,共6页
Nano-rod and bow-tie antennas that are gold nano-antennas on dielectric material and the nano-rod antenna arrays are numerically studied by the finite difference time domain method in three dimensions. The light field... Nano-rod and bow-tie antennas that are gold nano-antennas on dielectric material and the nano-rod antenna arrays are numerically studied by the finite difference time domain method in three dimensions. The light field that project on the antennas can be confined to a spot with subwavelength width (-λ/11),and the light intensity can be enhanced to 91 times the incident light in the near-field with the bow-tie antenna. The enhancement also exists in the antenna arrays. The highest enhancement of the light intensity at the bow-tie antenna gap can reach about 28000 times,and the localized field can be coupled to a nano-particle near the antenna gap. 展开更多
关键词 near-field optics surface plasmons optical antenna
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Magnetic reconnection driven by intense lasers 被引量:1
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作者 Jiayong Zhong Xiaoxia Yuan +2 位作者 Bo Han Wei Sun Yongli Ping 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第3期85-101,共17页
Laser-driven magnetic reconnection(LDMR) occurring with self-generated B fields has been experimentally and theoretically studied extensively, where strong B fields of more than megagauss are spontaneously generated i... Laser-driven magnetic reconnection(LDMR) occurring with self-generated B fields has been experimentally and theoretically studied extensively, where strong B fields of more than megagauss are spontaneously generated in highpower laser–plasma interactions, which are located on the target surface and produced by non-parallel temperature and density gradients of expanding plasmas. For properties of the short-lived and strong B fields in laser plasmas, LDMR opened up a new territory in a parameter regime that has never been exploited before. Here we review the recent results of LDMR taking place in both high and low plasma beta environments. We aim to understand the basic physics processes of magnetic reconnection, such as particle accelerations, scale of the diffusion region, and guide field effects. Some applications of experimental results are also given especially for space and solar plasmas. 展开更多
关键词 high energy density physics laser plasmas interaction plasmas astrophysics
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Implementation of a Faraday rotation diagnostic at the OMEGA laser facility 被引量:1
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作者 A.Rigby J.Katz +5 位作者 A.F.A.Bott T.G.White P.Tzeferacos D.Q.Lamb D.H.Froula G.Gregori 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第3期102-111,共10页
Magnetic field measurements in turbulent plasmas are often difficult to perform. Here we show that for kG magnetic fields, a time-resolved Faraday rotation measurement can be made at the OMEGA laser facility. This dia... Magnetic field measurements in turbulent plasmas are often difficult to perform. Here we show that for kG magnetic fields, a time-resolved Faraday rotation measurement can be made at the OMEGA laser facility. This diagnostic has been implemented using the Thomson scattering probe beam and the resultant path-integrated magnetic field has been compared with that of proton radiography. Accurate measurement of magnetic fields is essential for satisfying the scientific goals of many current laser–plasma experiments. 展开更多
关键词 ALIGNMENT CONTROLS DIAGNOSTICS high energy density physics high power laser laser-plasma interaction
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Characteristics of ion debris from laser-produced tin plasma and mitigation of energetic ions by ambient gas 被引量:4
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作者 YingBo Sun JingQuan Lin +1 位作者 Xun Gao ZhenMing Zhao 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第3期392-395,共4页
Extreme ultraviolet lithography is most promising for the next generation lithography. However, debris from laser-produced plasma, particularly energetic ions, severely decreases the lifetime of extreme ultraviolet op... Extreme ultraviolet lithography is most promising for the next generation lithography. However, debris from laser-produced plasma, particularly energetic ions, severely decreases the lifetime of extreme ultraviolet optics. We measured the characteris- tics of ions from tin plasma by the time of flight method with a frequency-doubled Nd: YAG laser at the intensity of 3.5x1010 W/cm2 (532 nm, 8 ns). Our measurement shows that the maximum and peak of tin ions energies from plasma under the above experimental parameters are about 4.2 and 1.8 keV, respectively. Moreover, it is found that kinetic energy angular distribution of tin ions can be fitted by cos0.8(θ), where θ is the angle with respect to the target normal. We also investigated the mitigation effect of argon, helium gases to the tin ions, and found that tin ions from the plasma can be mitigated effectively at the pressure -38 mTorr for argon or -375 mTorr for helium, respectively. 展开更多
关键词 extreme ultraviolet source tin plasma ION ambient gas
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Laboratory study of astrophysical collisionless shock at SG-Ⅱ laser facility 被引量:1
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作者 Dawei Yuan Huigang Wei +26 位作者 Guiyun Liang Feilu Wang Yutong Li Zhe Zhang Baojun Zhu Jiarui Zhao Weiman Jiang Bo Han Xiaoxia Yuan Jiayong Zhong Xiaohui Yuan Changbo Fu Xiaopeng Zhang Chen Wang Guo Jia Jun Xiong Zhiheng Fang Shaoen Jiang Kai Du Yongkun Ding Neng Hua Zhanfeng Qiao Shenlei Zhou Baoqiang Zhu Jianqiang Zhu Gang Zhao Jie Zhang 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第3期65-72,共8页
Astrophysical collisionless shocks are amazing phenomena in space and astrophysical plasmas, where supersonic flows generate electromagnetic fields through instabilities and particles can be accelerated to high energy... Astrophysical collisionless shocks are amazing phenomena in space and astrophysical plasmas, where supersonic flows generate electromagnetic fields through instabilities and particles can be accelerated to high energy cosmic rays. Until now, understanding these micro-processes is still a challenge despite rich astrophysical observation data have been obtained. Laboratory astrophysics, a new route to study the astrophysics, allows us to investigate them at similar extreme physical conditions in laboratory. Here we will review the recent progress of the collisionless shock experiments performed at SG-II laser facility in China. The evolution of the electrostatic shocks and Weibel-type/filamentation instabilities are observed. Inspired by the configurations of the counter-streaming plasma flows, we also carry out a novel plasma collider to generate energetic neutrons relevant to the astrophysical nuclear reactions. 展开更多
关键词 collisionless shock electromagnetic field high power lasers laboratory astrophysics
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Experimental platform for the investigation of magnetized-reverse-shock dynamics in the context of POLAR
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作者 B. Albertazzi E. Falize +24 位作者 A. Pelka E Brack E Kroll R. Yurchak E. Brambrink E Mabey N. Ozaki S. Pikuz L. Van Box Som J. M. Bonnet-Bidaud J. E. Cross E. Filippov G. Gregori R. Kodama M. Mouchet T. Morita Y. Sakawa R. E Drake C. C. Kuranz M. J.-E. Manuel C. Li E Tzeferacos D. Lamb U. Schramm M. Koenig 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第3期36-49,共14页
The influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision with a solid obstacle is investigated experimentally and numerically. The laser irradiation (I ... The influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision with a solid obstacle is investigated experimentally and numerically. The laser irradiation (I - 2 × 10^14 W. cm-2) of a multilayer target generates a shock wave that produces a rear side plasma expanding flow. Immersed in a homogeneous 10 T external magnetic field, this plasma flow propagates in vacuum and impacts an obstacle located a few mm from the main target. A reverse shock is then formed with typical velocities of the order of 15-20 4- 5 km/s. The experimental results are compared with 2D radiative magnetohydrodynamic simulations using the FLASH code. This platform allows investigating the dynamics of reverse shock, mimicking the processes occurring in a cataclysmic variable of polar type. 展开更多
关键词 accretion processes high-power laser HYDRODYNAMICS laboratory astrophysics POLAR radiative shocks
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Reductive immobilization of Re(VⅡ)by graphene modified nanoscale zero-valent iron particles using a plasma technique 被引量:10
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作者 Jie Li Changlun Chen +1 位作者 Rui Zhang Xiangke Wang 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第1期150-158,共9页
Technetium-99(~99Tc),largely produced by nuclear fission of ~235U or ~239Pu,is a component of radioactive waste.This study focused on a remediation strategy for the reduction of pertechnetate(Tc O_4^-)by studying its ... Technetium-99(~99Tc),largely produced by nuclear fission of ~235U or ~239Pu,is a component of radioactive waste.This study focused on a remediation strategy for the reduction of pertechnetate(Tc O_4^-)by studying its chemical analogue rhenium(Re(VⅡ))to avoid the complication of directly working with radioactive elements.Nanoscale zero-valent iron particles supported on graphene(NZVI/r GOs)from GOs-bound Fe ions were prepared by using a H_2/Ar plasma technique and were applied in the reductive immobilization of perrhenate(Re O_4^-).The experimental results demonstrated that NZVI/r GOs could efficiently remove Re from the aqueous solution,with enhanced reactivity,improved kinetics(50 min to reach equilibrium)and excellent removal capacity(85.77 mg/g).The results of X-ray photoelectron spectroscopy analysis showed that the mechanisms of Re immobilization by NZVI/r GOs included adsorption and reduction,which are significant to the prediction and estimation of the effectiveness of reductive Tc O_4^- by NZVI/r GOs in the natural environment. 展开更多
关键词 reductive immobilization Re(VII) NZVI/r GOs plasma technique
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Carbon electrodes with ionophobic characteristics in organic electrolyte for high-performance electric double-layer capacitors 被引量:2
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作者 Xue Yin Jianqi Zhang +4 位作者 Le Yang Wende Xiao Lei Zhou Yujing Tang Wen Yang 《Science China Materials》 SCIE EI CAS CSCD 2022年第2期383-390,共8页
Activated carbon(AC)in organic electrolytebased electric double-layer capacitors(EDLCs)usually suffers from low specific capacitance.Most studies on AC focus on improving its surface area and optimizing pore structure... Activated carbon(AC)in organic electrolytebased electric double-layer capacitors(EDLCs)usually suffers from low specific capacitance.Most studies on AC focus on improving its surface area and optimizing pore structures to enhance its electrochemical performance in EDLCs.Unfortunately,the interfacial microenvironment,which is composed of nanoporous carbon and the organic electrolyte confined in it,is always ignored.Herein,a simple and powerful strategy to create AC with an ionophobic surface is proposed to address the poor efficiency of the electric doublelayer process.The polar C±F bonds formed in the AC material are characterized through near-edge X-ray absorption fine structure and X-ray photoelectron spectroscopy.The ionophobic characteristic of YP-F60 s in an organic electrolyte is extensively studied via contact angle measurements and smallangle X-ray scattering spectroscopy.An EDLC constructed with YP-F60 s as the electrode and 1 mol L^(-1) tetraethylammonium tetrafluoroborate/propylene carbonate as the electrolyte demonstrates high specific capacitance,low internal resistance,and excellent cycling stability.Our results successfully demonstrate the importance of the interfacial microenvironment of AC and its confined electrolyte to the electrochemical performance of EDLCs.Our work also offers new perspectives on the use of the CF;plasma technique to fabricate low-cost superior carbon for EDLCs. 展开更多
关键词 nanoporous carbon ionophobic characteristic organic electrolyte electric double-layer capacitors
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Preparation and performance evaluation of Er_2O_3 coating-type selective emitter
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作者 WANG HuJun YE Hong ZHANG YuZhi 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第2期332-338,共7页
An Er203 coating-type selective emitter for themophotovoltaic application was prepared by plasma spray technology. The test results show that plasma spray technology could be used to prepare the Er203 coating-type sel... An Er203 coating-type selective emitter for themophotovoltaic application was prepared by plasma spray technology. The test results show that plasma spray technology could be used to prepare the Er203 coating-type selective emitter with good stability at 1400℃. Based on the measurements of the high temperature normal spectral emissivity and the spectral hemispherical emissivity of the samples at room temperature, the influence of the coating thickness was discussed, and the selective emission performance of the sample was evaluated using radiative efficiency as the criterion. The results demonstrate that the emission of substrate could not be neglected unless the coating thickness would be larger than the penetration depth, which is around 100 μm. The selective emission peak of the Er203 coating occurs at 1550 nm, matching well with the GaSb cells. However, the radiative efficiency is not larger than that of the SiC emitter, because the non-convertible emission of 1.725-5 μm accounts for a large proportion of the total radiation power, especially at high temperature. Effective suppression of this band emission is essential to the improvement of the radiation efficiency of the emitter. 展开更多
关键词 THERMOPHOTOVOLTAIC Er203 radiative efficiency high temperature emissivity
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