Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1995, Vol.4, No.1
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CLASSICAL AREAS OF PHENOMENOLOGY

THEORETICAL STUDY OF SELF-STARTING MODE-LOCKED ALL-FIBER LASERS

SUN JUN-QIANG, HUANG DE-XIU, LI ZAI-GUANG
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 16-23 doi: 10.1088/1004-423X/4/1/003
Full Text: [PDF 202 KB] (Downloads:436)
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In this paper, the self-startlng mode-locking characteristics of all-fiber lasers are in-vestigated theoretically. The mechanism of self-starting mode-locking is analyzed and the experimental phenomena are explained successfully by introducing effective energy gain. The modulation characteristics of all-fiber lasers and the effect of gain saturation on modulation characteristics are discussed by analyzing the transmissivity of Er-doped fiber loop. Finally, the dynamic processes of all-fiber self-starting mode-locked lasers are simulated numerically.

SPECTRA, ENERGY LEVELS AND UP-CONVERSION EFFECT OF ERBIUM IONS IN LiNbO3 CRYSTALS

RUAN YONG-FENG, LI BAO-LING, LI WEN-RUN, WAN LIANG-FENG
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 24-32 doi: 10.1088/1004-423X/4/1/004
Full Text: [PDF 237 KB] (Downloads:320)
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The Optical properties and spectral data of erbium-doped Lithium Niobate crystals,including absorption spectrum, emission spectrum, luminescence lifetime and up-conversion effects are reported in this paper. The energy level scheme, Stark splitting under crystal field and up-conversion mechanism are discussed in detail. The possible applications of this material in waveguide optics and opto-electronics are also prospected.

A STUDY OF THE PHYSICAL PROPERTIES OF ZEEMAN ABSORPTION FARADAY ANOMALOUS DISPERSION OPTICAL FILTER

DUAN MING-HAO, LI YI-MIN, TANG JUN-XIONG, WANG QING-JI
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 33-38 doi: 10.1088/1004-423X/4/1/005
Full Text: [PDF 149 KB] (Downloads:381)
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This paper reports what is to our knowledge the first demonstration of Zeeman absorption Faraday anomalous dispersion optical filter (hereafter abbreviated to FADOF/Zeeman). The mutual relations among passband, tuning capability, cell temperature and magnetic field of FADOF/Zeeman have been studied theoretically and experimentally. The results showed that the single passband of FADOF/Zeeman was about 1 GHz, which is 3 times less than the passband of FADOF. The tuning capability was about 1 GHz/0.01 T.
ATOMIC AND MOLECULAR PHYSICS

DISTORTED WAVE CORRECTION OF CENTRIFUGAL SUDDEN WAVE PACKET APPROXIMATION

REN TING-QI, LI DAI-QING, LIU SHENG-DIAN, ZHANG QING-GANG
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 1-5 doi: 10.1088/1004-423X/4/1/001
Full Text: [PDF 122 KB] (Downloads:314)
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A distorted wave procedure is employed to correct the centrifugal sudden wave packet approximation, and the accurate results compared with the standard close coupling method for m-dependent integral cross sections for short- and long- range Ar+N2 potentials at E=O.O258eV are obtained only by using the second-order corrections to the CSWP wave function.

STUDY OF THE DOPPLER-FREE OPTICAL-OPTICAL TRIPLE-RESONANCE(DF-OOTR) SPECTROSCOPY AND ITS LINESHAPES

PAN YONG-LE, XIA HUI-RONG, YE CUN-YUN, DING LIANG-EN, MA LONG-SHENG, WANG ZU-GENG
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 6-15 doi: 10.1088/1004-423X/4/1/002
Full Text: [PDF 313 KB] (Downloads:347)
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The Doppler-free optical-optical triple-resonance(DF-OOTR) spectroscopy and its line-shapes have been studied in detail theoretically and experimentally. The line center, linewidth and lineshape of an isolated DF-OOTR spectra component have been derived by using density matrix motion equation describing the interaction of a three-level system with three optical fields. The variations of the lineshape symmetry, the relative position and the strength of the Doppler-free Lorentzian dip to its background are comparable to the experimental traces varying with the relative intensities of the two mutual-saturating probe laser beams, as well as with the detuning of the first pumping laser from the intermediate level. The DF-OOTR technique shows a distinguished advantage especially in the labeling of the transitions and in the determination of absolute position of the upper level affected by perturbation shift, as these happened often in the dense molecular highly excited states.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

THE ELECTRON CYCLOTRON RESONANCE HEATING EXPERIMENTS ON HL-1 TOKAMAK

XU YAO-CONG, XUE SI-WEN, LIU YONG, XU DE-MING, GUO GAN-CHENG, DING XUAN-TONG, CHEN MIAO-WEN, YU LI-MU, JIANG XIU-FANG, LI XIAO-DONG, DENG XI-WEN, WANG EN-YAO, YANG SI-ZE, YAO XIN-ZI, V.V.ROZHDESTVENSK
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 39-46 doi: 10.1088/1004-423X/4/1/006
Full Text: [PDF 213 KB] (Downloads:304)
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The electron cyclotron resonance heating (ECRH) experiments on HL-1 tokamak with 300kW of power generated by a gyrotron are described. With ECE diagnostics, a 30% increase of electron temperature has been obtained. The following phenomena have been observed with various diagnostics during ECRH: increase of radiation intensity of soft X-ray;amplitude change and period elongation of sawtooth oscillation; MHD instability suppression; increase of Hα spectral fine intensity and ionized impurity radiation from edge plasma;increase of the temperature and density of edge plasma. Although the total plasma energy content increases, the energy confinement time is decreased. Initial results of low voltage start-up experiments have also been obtained.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

STUDY ON THE STABILITY OF GaAs/AlGaAs SUPERLATTICE STRUCTURE

XU XIAN-GANG, HUANG BAI-BIAO, REN HONG-WEN, JIANG MIN-HUA
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 47-53 doi: 10.1088/1004-423X/4/1/007
Full Text: [PDF 207 KB] (Downloads:352)
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This paper reports the stability of GaAs/AlGaAs superlattice structures after theorem annealing, Zn diffusion and MeV Si+ ion implantation. The MeV Si+ ion implantation induced damage in GaAs/AlGaAs superlattices, its annealing properties, and the effects on superlattice structure stability are reported as well. Thermal annealing at 650℃ for 30min has little effect on superlattice structure. Zn diffusion may induce superlattice layer disordering. And annealing at 650℃ for 30min can eliminate damage caused by 2.3MeV,1.5×1015 cm-2 Si+ ion implantation, which cannot induce superlattice layer disordering.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

A TWO-STATE MODEL FOR NON-EXPONENTIAL RELAXATION IN CONDENSED MATTER

WEN CHAO
Acta Phys. Sin. (Overseas Edition), 1995, 4 (1): 54-61 doi: 10.1088/1004-423X/4/1/008
Full Text: [PDF 232 KB] (Downloads:273)
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A two-state model is presented for polarization relaxation in condensed matter. The dynamics of relaxation is treated with quantum transition theory. The physical meaning of the so-called time-dependent transition rate is clarified. The new model not only gives the fractional exponential and power-law relaxation functions naturally, but also indicates that the universality of the relaxation law results from the scaling behavior of low-frequency effective spectrum.
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