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An Octave-Spanning,Kerr-Lens Mode-Locked Ti:sapphire Oscillator with Double-Chirped Mirrors and BaF_(2)

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Chinese physics Letters 2012年第11期29卷 88-90页

作者： ZHANG long HAN Hai-Nian ZHANG Qing WEI Zhi-Yi Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190

We demonstrate an octave-spanning Kerr-lens mode-locked Ti:sapphire laser with double-chirped mirrors(DCMs),BaF_(2) wedges and plate,which generates laser pulses in the spectrum range from 600 nm to 1200 nm at-45 dB below the maximum and the duration of 8.5 fs at the repetition rate of 80 *** average output power is 100 mW under 5 W pump *** carefully adjusting the insertion of BaF_(2) wedges and the optimization position of Ti:sapphire crystal in the cavity,we can obtain the smooth swings in the interferometric autocorrelation trace due to good third-order dispersion compensation.

关键词： pump wedge repetition

Evolution of the Topological Linear Defects

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Chinese physics Letters 1999年第3期16卷 157-159页

作者： DUAN Yi-shi JIANG Ying YANG Guo-hong institute of Theoretical physics Lanzhou UniversityLanzhou 730000 Department of physics Fudan UniversityShanghai 200433

In the light of ø-mapping method and topological current theory,the topological structure and the topological quantization of topological linear defects are obtained under the condition that Jacobian J(ø/v)≠*** J(ø/v)=0,it is shown that there exists the crucial case of branch *** on the implicit function theorem and the Taylor expansion,the generation,annihilation and bifurcation of the linear defects are detailed in the neighborhoods of the limit points and bifurcation points of ø-mapping,respectively.

关键词： process. topological bifurcation

Tuning energy output of PTFE/Al composite materials through gradient structure

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Defence Technology（防务技术） 2023年第8期26卷 134-142页

作者： Yao-feng Mao Qian-qian He Jian Wang Chuan-hao Xu Jun Wang Fu-de Nie China Academy of Engineering physics institute of Chemical Materials China

As a typical energetic composite,polytetrafluoroethylene(PTFE)/aluminum(Al)has been widely applied in explosives,pyrotechnics,and propellants due to its ultra-high energy density and intense exothermic *** this work,the radial gradient(RG)structure of PTFE/Al cylinders with three different PTFE morphologies(200 nm and 5μm particles and 5μm fiber)and content changes are prepared by 3D printing *** effect of radial gradient structure on the pressure output of PTFE/Al has been *** with the morphology change of PTFE,the change of component content in the gradient structure has an obvious effect on the pressure output of the PTFE/Al ***,the relationships of the morphology,content of PTFE and the combustion reaction of the PTFE/Al cylinder reveal that the cylinder shows a more complex flame propagation process than *** results could provide a strategy to improve the combustion and pressure output of PTFE/Al.

关键词： PTFE/Al composite Gradient structure Radial gradient Pressure output

Strongly Correlated Effect in TiS2

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Chinese physics Letters 2007年第4期24卷 1050-1053页

作者：乔彦彬钟国华李地王江龙秦晓英曾雉 Key Laboratory of Materials physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031

The thermoelectric compound TiS2 is studied by using the full-potential linearized augmented plane-wave method on the density functional theory with the generalized gradient approximation （GGA） as well as the on-site Coulomb interaction correction （＋U）. The Seebeck coefficient of TiS2 is calculated based on the electronic structure obtained within the GGA under the consideration of the on-site Coulomb interaction. The calculated Seebeck coefficient at 300K shows that Coulomb interaction U in the range of 4.97-5.42eV is important to reproduce the experimental data. The obtained energy gap Eg around 0.05 eV indicates that TiS2 is an indirect narrow-gap semiconductor.

关键词： TRANSITION-METAL DICHALCOGENIDES ANGLE-RESOLVED PHOTOEMISSION SOLID-SOLUTIONS TIXTA1-XS2 X-RAY-ABSORPTION ELECTRONIC-STRUCTURE BAND-STRUCTURE SEMIMETALTRANSITION TRANSPORT-PROPERTIES OPTICAL-PROPERTIES GROUP-IVA

Different Types of Synchronization in Time-Delayed Systems

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Chinese physics Letters 2007年第1期24卷 50-53页

作者：冯存芳张岩汪映海 institute of Theoretical physics Lanzhou University Lanzhou 730000

We investigate different types of synchronization between two unidirectionally nonlinearly coupled identical delay- differential systems related to optical bistable or hybrid optical bistable devices. This system can represent some kinds of delay-differential models, i.e. Ikeda model, Vall^e model, sine-square model, Mackey Glass model, and so on. We find existence and sufficient stability conditions by theoretical analysis and test the correctness by＂ numerical simulations. Lag, complete and anticipating synchronization are observed, respectively. It is found that the time-delay system can be divided into two parts~ one is the instant term and the other is the delay term. Synchronization between two identical chaotic systems can be derived by adding a coupled term to the delay term in the driven system.

关键词： Different Types Synchronization Time-Delayed Systems

Optical Absorption and X-Ray Diffraction Studies of Sulfur Under High Pressure

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Chinese physics Letters 1999年第9期16卷 675-676页

作者： CHEN Liang-chen WANG Li-jun institute of physics Chinese Academy of SciencesBeijing 100080

In situ high pressure optical absorption measurements of sulfur have been carried out by using DAC device with a TASCO V-550 UV-VIS spectrophotometer at pressures up to 41.6 *** curves of absorption edge vs pressure were obtained,in which there are two turning points at about 5 and 12 GPa,corresponding to two changes of colour in the optical observation:one is from yellow to red and the other from red to black at 5-6.5 and 10-12 GPa,*** absorption edge reaches above 800 nm when the pressure is increased to 23 *** structure and phase transitions have also been investigated by using in situ high pressure energy-dispersive x-ray diffraction with synchrotron radiation at pressures up to 33.7 *** structure phase transition occurs at 5-6 GPa,but there is a new high-pressure phase,caused probably by the reorieutation or ordering of Sq.

关键词： absorption Sulfur turning

Relativistic solutions for diatomic molecules subject to pseudoharmonic oscillator in arbitrary dimensions

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Chinese physics B 2013年第7期22卷 64-69页

作者： Sami Ortakaya institute of Natural and Applied Sciences Department of PhysicsErciyes University

The exact solutions of the N-dimensional Klein–Gordon equation in the presence of an exactly solvable potential of V（r）=De（r/re-re/r）2 type have been obtained. The N dimensional Klein-Gordon equation has been reduced to a first-order differential equation via Laplace transformation. The exact bound state energy eigenvalues and corresponding wave functions for CH,H2,and HCl molecules interacting with pseudoharmonic oscillator potential in the arbitrary N dimensions have been determined. Bound state eigenfunctions used in applications related to molecular spectroscopy are obtained in terms of confluent hypergeometric functions.

关键词： Klein–Gordon equation Laplace integral transform bound states

Effect of Crucibles on Qualities of Self-Seeded Aluminium Nitride Crystals Grown by Sublimation

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Chinese physics Letters 2007年第12期24卷 3555-3558页

作者：韩奇峰段铖宏邱凯姬长健李新化钟飞尹志军曹先存周秀菊王玉琦 Key Laboratory of Material physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031

Self-seeded aluminium nitride （AlN） crystals are grown in tungsten and hot pressed boron nitride （HPBN） crucibles with different shapes by a sublimation method. The qualities of the AlN crystals are characterized by high-resolution transmission electronic microscopy （HRTEM）, scanning electron microscopy （SEM） and Micro-Rarnan spectroscopy. The results indicate that the better quality crystals can be collected in conical tungsten crucible.

关键词： thermoelectric half-Heusler compounds thermal conductivity

Split-ring-based metamaterial for far-field subwavelength focusing based on time reversal

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Chinese physics B 2014年第6期23卷 199-205页

作者：黄海燕丁帅王秉中臧锐 institute of Applied physics University of Electronic Science and Technology of China

In this paper, split-ring-based metamaterial sheets are designed for the purpose of achieving far-field subwavelength focusing, with the aid of a time-reversal technique. The metamaterial sheets are inserted into a subwavelength array consist- ing of four element antennas, with the element spacing being as small as 1/15 of a wavelength. Experiments are performed to investigate the effect of the metamaterial sheets on the focusing resolution. The results demonstrate that in the presence of the metamaterial sheets, the subwavelength array exhibits the ability to achieve super-resolution focusing, while there is no super-resolution focusing without the metamaterial sheets. Further investigation shows that the metamaterial sheets are contributive to achieving super-resolution by weakening the cross-correlations of the channel impulse responses between the array elements.

关键词： time-reversal metamaterial subwavelength focusing