Chin. Phys. B
Citation Search Quick Search

ISSN 1674-1056 (Print)
CN 11-5639/O4
About
   » About CPB
   » Editorial Board
   » SCI IF
   » Staff
   » Contact
Browse CPB
   » In Press
   » Current Issue
   » Earlier Issues
   » View by Fields
   » Top Downloaded
   » Sci Top Cited
Authors
   » Submit an Article
   » Manuscript Tracking
   » Call for Papers
   » Scope
   » Instruction for Authors
   » Copyright Agreement
   » Templates
   » Author FAQs
   » PACS
Referees
   » Review Policy
   » Referee Login
   » Referee FAQs
   » Editor in Chief Login
   » Editor Login
   » Office Login
Links
   »
HighLights More»   
Chin. Phys. B  
  Chin. Phys. B--1996, Vol.5, No.1
Select | Export to EndNote
GENERAL

DETERMINATION OF CAPTURE BARRIERS OF DEFECTS FOR GaAs ALLOYS AND TRANSIENT PHOTO-RESISTIVITY SPECTROSCOPY

WANG HAI-LONG, FENG SONG-LIN, ZHOU JIE, YANG XI-ZHEN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 1-9 doi: 10.1088/1004-423X/5/1/001
Full Text: [PDF 229 KB] (Downloads:317)
Show Abstract
Si-doped Ga0.7Al0.3As grown by molecular beam epitaxy (MBE) and undoped Ga0.47Al0.53As grown by chemical beam epitaxy (CBE) have been investigated using a new deep level characterization method-transient photo-resistivity spectroscopy, which we recently developed. This method measures directly the capture process of deep centers. In GaAlAs, apparent capture barrier energy EB= 0.25eV of DX center was determined and intrinasic capture barrier energy Eσ = 0.16eV was directly measured. In GaInAs, a defect with capture barier energy EB= 0.2BeV was observed. The result proved that DX centers capture electron only from band L, belonging to small lattice relaxation model. The theoretical deduction of transient photo-resistivity spectroscopy was improved.
CLASSICAL AREAS OF PHENOMENOLOGY

SUPERRADIANCE EFFECT OF THE CRYSTAL-LIKE-GAS

LING TIAN, GUO GUANG-CAN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 15-23 doi: 10.1088/1004-423X/5/1/003
Full Text: [PDF 173 KB] (Downloads:243)
Show Abstract
Crystal-like-gas (CLG) is a new kind of matter in which the atoms are arranged periodically in the space and the electrons are bound to the corresponding atoms. In this paper, we study the superradiance effect of CLG and discuss some interesting new properties due to the periodic structure of CLG. The non-ideal situation is also discussed.

ASYMMETRIC CONTROL CHARACTERISTICS OF DYE BDN ON THE TWO TRAVELLING WAVES IN A RING YAG LASER

HUANG MAO-QUAN, ZHENG JIN-LING, LI RUI-NING, GAO JIANG-RUI, ZHANG KUAN-SHOU, SU DA-CHUN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 24-30 doi: 10.1088/1004-423X/5/1/004
Full Text: [PDF 142 KB] (Downloads:266)
Show Abstract
It is discovered experimentally that, when placing a plate of dye BDN in a ring YAG laser cavity, the dye shows asymmetric control actions on the clockwise and counter-clockwise travelling waves. Unidirectional dye Q-switched operation is realized in a ring cavity based on this property without the use of Faraday rotator, polarizer and half-wave plate. A simplified theoretical analysis of this phenomenon is presented.

PHASE SPACE ANALYSIS OF FREE ELECTRON LASER EFFICIENCY REDUCTION DUE TO RANDOM FIELD ERROR

HU SU-XING, FU EN-SHENG
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 31-38 doi: 10.1088/1004-423X/5/1/005
Full Text: [PDF 206 KB] (Downloads:337)
Show Abstract
Considering the random field error of the wiggler, we deduce the equation of phase motion and calculate the phase volume of interaction in a real helical wiggler. The result was compared with the case of the ideal wiggler field. We analyze how the random field error causes the efficiency of free electron laser (FEL) to reduce, and simulate the FEL efficiency reduction effect according to the mechanisms which we present in this paper. The consequence agrees excellently with the experiment.

EXPERIMENTAL STUDY ON THE SELF-MODE-LOCKED Ti:SAPPHIRE LASER

XING QI-RONG, ZHANG WEI-LI, LU WEI, K.M.YOO, J.LUENG
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 39-45 doi: 10.1088/1004-423X/5/1/006
Full Text: [PDF 223 KB] (Downloads:335)
Show Abstract
The role of gain aperture in self-mode-locked Ti:sapphire laser was verified in our experiments. The observation of self-Q switching of self-mode-locked Ti:sapphire laser is reported. And tuning pulse duration from 50fs to 14.5ps was achieved.

THEORETICAL INVESTIGATION OF SOLID FEMTOSECOND LASER AMPLIFIER

ZHAO YING-QIAO, ZHANG RUO-BIN, WANG QING-YUE
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 46-57 doi: 10.1088/1004-423X/5/1/007
Full Text: [PDF 355 KB] (Downloads:266)
Show Abstract
In this article, we present a theoretical description of the various effects on femtosecond light pulse during its propagating through a long solid gain medium on the basis of Maxwell equations and rate equations, By numerical simulation, we analyzed the variation of pulse energy, pulse duration. pulse shape and spectral distribution due to gain saturation, spectral narrowing, phase-shift induced by gain, group-velocity dispersion and self-phase modulation.
ATOMIC AND MOLECULAR PHYSICS

EXAFS STUDY OF THE LOCAL STRUCTURE NANOCRYSTALLINE FeZrB(Cu) SOFT MAGNETIC ALLOYS

HU XIAO-JUN, WU QIU-LIN, JI YU, MAN YI-JUN, YU KE, LING GANG, YANG GUO-BIN, WANG RUN, XIE YA-NING
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 10-14 doi: 10.1088/1004-423X/5/1/002
Full Text: [PDF 145 KB] (Downloads:372)
Show Abstract
The changes of local structures around Fe and Zr atoms in the nanocrystalline films of Fe85Zr9B6 and Fe84Zr9B6 Cu1 alloys during annealing process were investigated by extended X-ray absorption fine structure (EXAFS) technique. It is confirmed that Zr atoms always exist in amorphous phase and do not dissolve in the bcc α-Fe crystalline phase. The addition of 1 at% Cu lowers the crystallization temperature.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

THE DECISIVE ROLE OF m= 1 AND 2 PERTURBATIONS IN DENSITY LIMIT DISRUPTIONS ON TEXTOR

KUANG GUANG-LI, G.WAIDMANN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (1): 58-70 doi: 10.1088/1004-423X/5/1/008
Full Text: [PDF 433 KB] (Downloads:284)
Show Abstract
The behavior of magnetohydrodynamic phenomena associated with disruptions of ohmically heated density limit discharges (qa=3.9) in the TEXTOR tokamak has been investigated in detail. A minor disruption is demonstrated to be only due to an tn = 2 mode instability, possibly due to the magnetic reconnection of an m=2 island. When the m = 2 mode oscillations cease, the internal m = 1 kink mode instability is drastically enhanced at once, twisting the plasma core considerably. If the twisting is too strong, the twisted plasma core is inevitably displaced to the outside and brings cold plasma to the central region, leading to the energy quench at a major disruption.
Copyright © the Chinese Physical Society
Address: Institute of Physics, Chinese Academy of Sciences, P. O. Box 603,Beijing 100190 China(100190)
Tel: 010-82649026   Fax: 010-82649027   E-Mail: cpb@aphy.iphy.ac.cn
Supported by Beijing Magtech Co. Ltd. Tel: 86-010-62662699 E-mail: support@magtech.com.cn