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四元Heusler合金NiMnFeGa中Fe原子的磁性贡献

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物理学报 2003年第9期52卷 2304-2308页

作者：千正男隋郁刘玉强柳祝红刘国栋张铭崔玉亭陈京兰吴光恒哈尔滨工业大学凝聚态科技中心哈尔滨150001 中国科学院物理研究所磁学国家重点实验室北京100080

用熔炼和甩带的方法制备了组分为Ni50 FexMn2.5-xGa2.5(x =0— 2.5 )的系列样品 .x射线衍射实验结果表明 ,当Fe取代Mn的含量x 17时 ,普通熔炼方法只能得到低有序度的γ相 ,只有采用甩带急冷的方法才能获得高度有序的纯L2.1 结构的化合... 详细信息

用熔炼和甩带的方法制备了组分为Ni50 FexMn2.5-xGa2.5(x =0— 2.5 )的系列样品 .x射线衍射实验结果表明 ,当Fe取代Mn的含量x 2.1 结构的Heusler相 .而当x >17时 ,普通熔炼方法只能得到低有序度的γ相 ,只有采用甩带急冷的方法才能获得高度有序的纯L2.1 结构的化合物 .根据交流磁化率和分子磁矩的测试结果 ,初步分析了Fe原子对化合物磁性的贡献 ,认为Fe原子占据了Mn原子的位置后 ,具有高于一般含铁合金的原子磁矩 ,可达 2. 5 5— 3 5 5 μB.

关键词：铁磁性形状记亿合金 NiMnFeGa合金 Fe原子磁性马氏体相变磁性参量四元Heusler合金

Improvement of laser damage thresholds of fused silica by ultrasonic-assisted hydrofluoric acid etching

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chinese physics B 2017年第11期26卷 510-514页

作者：李源严鸿维杨科姚彩珍王志强闫春燕邹鑫书袁晓东杨李茗巨新 University of Science and Technology beijing Department of Physics China academy of Engineering physics Laser Fusion Research Center Fine optical Engineering Research center

Polished fused silica samples were etched for different durations by using hydrofluoric（HF） acid solution with HF concentrations in an ultrasonic field. Surface and subsurface polishing residues and molecular structure parameters before and after the etching process were characterized by using a fluorescence microscope and infrared（IR） spectrometer, respectively. The laser induced damage thresholds（LIDTs） of the samples were measured by using pulsed nanosecond laser with wavelength of 355 nm. The results showed that surface and subsurface polishing residues can be effectively reduced by the acid etching process, and the LIDTs of fused silica are significantly improved. The etching effects increased with the increase of the HF concentration from 5 wt.% to 40 wt.%. The amount of polishing residues decreased with the increase of the etching duration and then kept stable. Simultaneously, with the increase of the etching time, the mechanical strength and molecular structure were improved.

关键词： HF etching fused silica laser induced damage threshold infrared spectra

Novel Fast Measurement Method of Twist Angle and optical Retardation of Liquid Crystal Display

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Novel Fast Measurement Method of Twist Angle and Optical Ret...

2.07亚洲显示国际会议

作者： Xia Huang~(1,2. Yun-Tao Lu~(1,2. Xiang-Jian Kong~(1,2. Hai Jing~1 Guo-Zhu Fu~1 Hu Jin~1 1 Changchun institute of Optics,Fine Mechanics and physics,{2. academy of Science North Liquid Crystal Engineering Research and Development center,Changchun 130033,China 2.Graduate School of the chinese academy of sciences,beijing 100000,China

＜正＞A novel method is proposed to measure twist angle and optical retardation of liquid crystal display in this *** new method which is one of single-wavelength methods has three characteristics:using circularly and homogeneously aligned LC cell（CH-LC）as a unique polarization-converting device;using variable sector diaphragm and photodetector to detect the total intensity of transmitted light whose original polarization direction is continuously changed from 0° to arbi- trary angle;introducting a method of measuring the total intensity ratio of the transmitted light to eliminate the influence of absorption by the polarizer,analyzer,CH-LC,liquid crystal display and so *** twist angle（φ）and optical retarda- tion（Δnd）can be derived by using Jones matrix analysis and a curve fitting where φ and Δnd are fitting ***- periment proved the results are accurate,the process of operation is fast,the devices are economical.

关键词： Liquid Crystal Display Twist Angle optical Retardation Circularly and Homogeneously Aligned LC Cell

激光二极管抽运的高效率Yb：YGG激光器的连续及锁模运转

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中国激光 2011年第2期38卷 37-40页

作者：张永东魏志义张治国钱德年吕亮曾晓东张怀金于浩海王继扬中国科学院物理研究所光物理重点实验室北京凝聚态物理国家实验室北京100190 西安电子科技大学技术物理学院陕西西安710071 山东大学晶体材料国家重点实验室山东济南250100

报道了激光二极管抽运下的高效率Yb:YGG连续及锁模激光器。实验中采用光学浮区法生长的高质量Yb:YGG激光晶体,在6.7 W的入射抽运功率下得到了1.95 W的激光输出,光-光转换效率为2..1%,最大斜率效率为60%。用半导体可饱和吸收镜启动锁模,... 详细信息

报道了激光二极管抽运下的高效率Yb:YGG连续及锁模激光器。实验中采用光学浮区法生长的高质量Yb:YGG激光晶体,在6.7 W的入射抽运功率下得到了1.95 W的激光输出,光-光转换效率为2..1%,最大斜率效率为60%。用半导体可饱和吸收镜启动锁模,在没有补偿色散的情况下得到了1 W的激光输出,光-光转换效率为18.2.,脉冲宽度为2.1 ps,中心波长位于1035 nm。

关键词：激光器全固态激光器激光二极管抽运 Yb:YGG晶体皮秒

Blue Upconversion Luminescence from Yb3+-doped Oxyfluoride Vitroceramics Excited by 960nm Laser

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chinese Journal of Lasers 2001年第5期 50-53页

作者： CHEN Xiaobo 1 Masaaki Ohtsuka 2.WANG Guowen 3 1beijing Normal University Optics center, beijing 100875, China 2.umita optical Glass, INC. , Japan 3physics Department, Peking University, beijing 100871, China

This paper investigates the upconversion luminescence of Yb 3+ doped oxyfluoride vitroceramics excited by 960 nm diode laser. A new upconversion cooperative radiation luminescence is found, which is rather strong and positioned at 479 5 nm. It comes from a coupled state of two Yb 3+ ion cluster. It is of significance due to the effective method to obtain compact blue light.

关键词： upconversion luminescence Yb 3+ doped oxyfluoride ion cluster

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γ射线暴火球的演化与余辉

天文学报 2001年第1期42卷 16-21页

作者：黄文耿杨丕博陆烨华中师范大学物理系天体物理研究所中国科学院空间科学与应用研究中心北京100080

GRB主暴后 ,火球继续膨胀 ,根据暴后火球的动力学演化方程 ,考虑电子的分布随时间的变化 ,通过数值求解 ,得到光学R波段和X射线余辉与时间t的关系 .计算结果与观测结果相比较 ,符合得很好 .最后 ,还讨论了火球 +激波模型的不足 .

关键词： γ射线暴火球余辉能源机制 GRB 动力学演化方程

Initiating,growing and cracking of hydrogen blisters

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Science Bulletin 2005年第17期 148-151页

作者： REN Xuechong1, SHAN Guangbin1, CHU Wuyang1, SU Yanjing1, GAO Kewei1, QIAO Lijie1, JIANG Bo2. CHEN Gang2.& CUI Yinhui2.1. Department of Materials physics, University of Science and Technol-ogy beijing, beijing 100083, China 2. Technology center of Ma’anshan Steel & Iron Corporation, Ma’anshan 432.00, China

The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blis-ters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster (small cavity). Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with enter-ing of vacancies and hydrogen atoms. With increasing hy-drogen pressure, plastic deformation occurs first, the hydro-gen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propa-gating of cracks until it breaks.

关键词： hydrogen blister initiating growing cracking breaking.

The optical Design Of Dye-Sensitized Nanocrystalline Solar Cells

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The Optical Design Of Dye-Sensitized Nanocrystalline Solar C...

2.04全国太阳能光化学与光催化学术会议

作者： Xizhe Liu, Q.B. Meng. C.X Gao, B.F. Xue, H.X. Wang, ***, O. Sato and A. Fujishima ((beijing National laboratory for {2. matter physics.lnstitute of physics, chinese academy of sciences, beijing, 100080, China qbmeng@aphy. iphy. ac. cn & cxgao599@yahoo. com, cn State Key laboratory of Superhard Materials,institute of Atoms and Molecules, JiLin University, ChangChun, 130012. China. Reseach laboratory for {12. Science, Kanagawa academy of Science and Technology, KSP BLDG. EAST 412. Sakado, Kawasaki 2.3-0012. Japan)

＜正＞ Dye-Sensitized Nanocrystalline Solar Cells（DSSC）is a new kind of solar cell,which may be analternative to conventional silicon-based solar *** factors determine the overall efficiency ofsuch a cell for example TiO2.films,dyes,electrolyte,optical property of materials *** most ofthese factors have been studied extensively,the optical process in DSSC was studied very *** anoptical device,DSSC’S optical property is certainly *** this paper we developed a model,which

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Distinguishing the authenticity of anti-freeze liquid and brake fluid by terahertz time-domain spectra technology

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Distinguishing the authenticity of anti-freeze liquid and br...

中国光学学会2.10年光学大会

作者： ZHU Shou-ming 1,ZHAO Kun 1,2.4,TIAN Lu 1,ZHAO Song-qing 1,ZHAO Hui 1,BAO Ri-ma 1,MIAO Qing 1,ZHOU Qing-li 3,SHI Yu-lei 3,ZHAO Dong-mei 3,ZHANG Cun-lin 3 1.School of Science,China University of Petroleum,beijing 102.49,China 2.State Key laboratory of Heavy Oil Processing,China University of Petroleum,beijing 102.49,China 3.beijing Key laboratory for Terahertz Spectroscopy and Imaging,Key laboratory of Terahertz Optoelectronics,Ministry of Education,Department of physics,Capital Normal University,beijing 100048,China 4.International center for Materials physics,chinese academy of {12.,Shenyang 110016,China.

Terahertz time-domain spectra （THz-TDS） technology is a new kind of coherent far infrared spectroscopy measurement technique based on the femtosecond *** optical property and spectroscopy of methanol,anti-freeze liquid and brake fluid are studied based on the THz-TDS in the terahertz *** whether methanol exists in anti-freeze liquid or brake fluid by Using THz-TDS technology is crucial to its *** room temperature,the time-domain spectra and the absorption spectrum in the 0.2.2.5 THz region of these samples are obtained in the environment full of *** Results show that methanol,anti-freeze liquid and brake fluid have significant different absorption spectra in this wave *** absorption peaks of methanol are located at 0.72.THz and 0.35 THz and the main absorption peaks of anti-freeze liquid and brake fluid are located at 0.62.***-TDS Technology can distinguish minor differences in structure and can be applied to physical testing and *** provides a new experimental method for the identification of the organic chemical products and the study of spectrum more wide.

关键词： terahertz methanol anti-freeze liquid brake fluid