期刊：
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE,1999年174(2):R11-R12 ISSN：1862-6300
通讯作者：
Huang, XT
作者机构：
[Wang, YQ; Huang, XT; Chen, QM; Wang, QL] National Lab. of Laser Technology, Huazhong Univ. of Sci., and Technol., Wuhan, 430074, China;[Huang, XT] Department of Physics, Central China Normal University, Wuhan, 430079, China
摘要：
Based on the mechanism of film growth in IBAD, it is demonstrated that the energetics and the inertness of the assisting ions are crucial for the in-plane textured microstructures of the depositing YSZ films, the size and the mass of assisting ion beam being not. When the O<sup>+</sup> ion beam energy is increased to 500 eV and an electrode of electrons is placed in the path of the O<sup>+</sup> ion beam to neutralize the O<sup>+</sup> ions, the textured YSZ buffer layer on stainless steel substrate can be obtained. Then, a high critical current density and in-plane YBCO assistance can be fabricated.
作者机构：
[Hu, XM; Peng, JS] Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hu, XM] H;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
激光;噪声;双量子跳动
摘要：
Noise squeezing of intensity difference between the pair of sum modes may be generated in a cascade laser of A and V quantum-beats. The best achievable squeezing is up to 50% below the shot noise limit. This new kind of squeezed lasers has potential for quantum communications and precision measurements.
摘要：
In this paper we investigate the quantum statistical properties in a cascade laser system with the lower transition being in a #LAMBDA# quantum-beat configuration. It is shown that a type of three-mode squeezing may be generated. The fluctuations of the intensity difference between the sum-mode from the quantum-beat and the cascade single mode may be reduced below the shot-noise limit. The best achievable noise reduction is up to 50%. Good squeezing occurs when the sum mode and the cascade single mode have normalized intensities much larger than unity and the intensity difference is much smaller than the respective intensity.
作者机构：
[Hu, XM; Peng, JS] Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hu, XM] H;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
European Physical Journal D;Atomic Physics;Molecular Physics;Optical physics;Plasma Physics;journal;EPJ
摘要：
On the basis of the nondegenerate Λ quantum-beat laser model, we introduce a coherent field which drives the transition between the upper lasing level and an auxiliary level. We demonstrate that such a four-level system can produce squeezed two-mode lasei without and with inversion. When the laser is operated well above threshold, the intensity fluctuation in the average mode is reduced below the shot noise with an optimum Mandel parameter Q = -1/2. At the same time, the noises in the relative amplitude and the relative phase drop to their vaccum noise levels. Fuithermore, regardless of inversion, noninversion, and transition between inversion and noninversion, the optimum Mandel Q parameter of Q = -1/2 is retained when the system operates well above threshold. A simple physical explanation of the squeezing mechanism for two-mode squeezing is given.
摘要：
Transverse momentum event-by-event fluctuations are studied within the string-hadronic model of high energy nuclear collisions, LUCIAE. Data on non-statistical PT fluctuations in p+p interactions are reproduced. Fluctuations of similar magnitude are predicted for nucleus-nucleus collisions, in contradiction to the preliminary NA49 results. The introduction of a string clustering mechanism (Firecracker Model) leads to a further, significant increase of PT fluctuations for nucleus-nucleus collisions. Secondary hadronic interactions, as implemented in LUCIAE, cause only a small reduction of PT fluctuations.
摘要：
Hadronic multiplicity distributions in small bins are studied within the Ginzburg-Landau description for quark-hadron phase transitions. Direct comparison of the distributions with Poisson ones (with the same averages) is made in the light of dynamical factors d<sub>q</sub> for the distributions and ratios D<sub>q</sub>, equivalent d<sub>q</sub>/ d<sub>1</sub>,. Scaling behavior between D<sub>q</sub>' s is found, which can be used to detect the formation of quark-gluon plasma. The same method can be used in the analysis of other processes without phase transition.
作者机构：
[Yang, CB; Cai, X] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Yang, CB] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
finite-size effect;scaling function
摘要：
The finite-size effects in critical phenomena of a thin film system are studied from a mean-field (MF) approach with phi(4) model for second-order phase transition. The influence of boundary condition on the critical properties is emphasized. Scaling functions for relative free-energy and relative specific heat are given.
通讯机构：
[Hou, DF] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
费籽系统;有限温度;谱密度;量子色动力学
摘要：
The pressure of a fermion system is expressed as a mass integral over the full two-point spectral densities within the real time formalism by use of the Keldysh representation for the propagators. This simplifies the calculation significantly and allows a Dyson resummation. The expression is used to demonstrate that potential infrared divergences are rendered harmless. We apply it to check the pressures of an ideal fermion gas and of a chemically non-equilibrated quantum chromodynamics plasma.
摘要：
We have studied the spectrum of spontaneous emission of a V-configuration three-level atom, whose two upper levels are linked by a classical driving field and their energy spacing is much larger than the spontaneous emission widths. It is shown Chat the spectrum can be controlled by the driving field and peaks with subnatural linewidth can be produced. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
摘要：
A superfluorescent source used for scanning near-field optical microscope (SNOM) has been developed in this paper. The superfluorescent source originates from an amplified spontaneous emission (ASE) produced by an Er-doped fiber, with a relatively wide spectrum from 1531 nm to 1537 nm. This kind of superfluorescent fiber probe has relatively high photon flux over an ordinary probe. Different image qualities are obtained by the SNOM system with the superfluorescent source and the laser source respectively. Experimental result shows that the coherent noise of the SNOM image is dramatically reduced with the superfluorescent source.
期刊：
Journal of Mathematical Physics,1999年40(9):4538-4548 ISSN：0022-2488
通讯作者：
Wu, SQ
作者机构：
[Cai, X; Wu, SQ] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, SQ] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
black holes, general relativity, wave equations, relativistic quantum field theory
摘要：
The covariant Klein-Gordon equation in the Kerr-Newman black hole geometry is separated into a radial part and an angular part. It is discovered that in the nonextreme case, these two equations belong to a generalized spin-weighted spheroidal wave equation. Then general exact solutions in integral forms and several special solutions with physical interest are given. While in the extreme case, the radial equation can be transformed into a generalized Whittaker-Hill equation. In both cases, five-term recurrence relations between coefficients in power series expansion of general solutions are presented. Finally, the connection between the radial equations in both cases is discussed. (C) 1999 American Institute of Physics. [S0022-2488(99)01608-4].
