Showing papers in "Chinese Physics Letters in 1986"
TL;DR: Using dye laser as pumping light source, Wang et al. as mentioned in this paper first realized on NYAB crystal the laser self-frequency doubling run from 1.06μm to 0.53μm.
Abstract: Using dye laser as pumping light source, we have first realized on NYAB crystal the laser self-frequency doubling run from 1.06μm to 0.53μm. The threshold energy is less than 4mJ; conversion efficiency is 6.2%, and the self-frequency-doubling green light output energy is 2.5mJ.
41 citations
TL;DR: In this article, the relationship between the luminescence concentration quenching effect and the structure characteristics of the crystals have been studied and the pulsed laser performance of this crystal, at an energy output of 422mJ, is reported.
Abstract: Neodymium Aluminum Borate crystals with dimensions up to 20×20×45mm3 have been grown successfully. Laser rod of 3.2mm×23.7mm can be fabricated from the crystal. The relationship between the luminescence concentration quenching effect and the structure characteristics of the crystals have been studied. The pulsed laser performance of this crystal, at an energy output of 422mJ, is reported.
22 citations
TL;DR: In this article, the surface loci and motion of solitons along lateral direction and the effects of dimension size or with partition on the waveform have been measured and observed carefully.
Abstract: The surface loci and motion of solitons along lateral direction and the effects of dimension size or with partition on the waveform have been measured and observed carefully. An approximate solution of surface displacement also has been given, which agrees well with the experimental values.
10 citations
TL;DR: In this paper, the existence of the energy level related to Pd in Si can lower the annealing temperature of A centers, but does not affect its generating rate, and the level ETC related to the Pd is the complex of the interstitial Pd and vacancy.
Abstract: The defects, whose structures are well known (for example, the complex of oxygen and vacancy-A center), were introduced in the p+n junction samples with diffused Pd by irradiation of electrons, and their interaction was promoted by annealing. The existance of the energy level related to Pd in Si can lower the annealing temperature of A centers, but does not affect its generating rate. The level ETC related to Pd is the complex of the interstitial Pd and vacancy.
9 citations
TL;DR: In this article, a radiofrequency heating Czochralski technique was used to obtain LiTaO3 crystals with modulated structure (periodic lamina of ferroelectric domains).
Abstract: A radio-frequency heating Czochralski technique to obtain LiTaO3 crystals with modulated structure (periodic lamina of ferroelectric domains) is first presented. The alternation of the ferroelectric domains whose half-period nearly corresponds to the coherence length Lc has been achieved. Quasi-phase-matching for the nonlinear coefficient d33 has been first realized using 1.06μm Nd:YAG laser in crystals LiTaO3.
8 citations
TL;DR: In this paper, the q-th order information dimension and the spectrum f(α) of singularities in the measure for the limiting sets of period-n-tupling sequences in the case of the logistic map were calculated.
Abstract: We calculated the q-th order information dimension Dq and the spectrum f(α) of singularities in the measure for the limiting sets of period-n-tupling sequences in the case of the logistic map.
7 citations
TL;DR: The crystal field parameters B20, B2-2, B40 and B44 were determined empirically on the basis of one sublattice model as mentioned in this paper, and these parameters can account for the major magnetic anisotropy of all of R2Fe14B (R: rare-earth) including the easy cone of Nd2Fe 14B and Ho 2Fe 14b at 4.2K.
Abstract: The crystal field parameters B20, B2-2, B40 and B44 are determined empirically on the basis of one sublattice model. These parameters can account for the major magnetic anisotropy of all of R2Fe14B (R: rare-earth) including the easy cone of Nd2Fe14B and Ho2Fe14B at 4.2K.
7 citations
TL;DR: In this paper, the dielectric function for direct interband transitions of critical point electrons in an n-dimensional crystal has been derived as the n/2-th iterated integrals of a harmonic oscillator.
Abstract: The dielectric function for direct interband transitions of critical point electrons in an n-dimensional crystal has been derived as the n/2-th iterated integrals of the dielectric function of a harmonic oscillator. A generalized expression for the derivatives of interband dielectric function has also been presented by fractional integration. The results present an explicit physical picture and provide a new approach to the investigations of optical properties of low dimensional and anisotropic crystals.
7 citations
TL;DR: In this article, the damage profiles of 40keV As+ implanted Si at doses of 4×1013 and 1.4×1014 ions cm-2 are compared with those determined by Rutherford backscattering.
Abstract: By means of optimization with a multilayer model, the damage profile can be obtained from the measured data by spectroscopic ellipsometry without stripping. The damage profiles of 40keV As+ implanted Si at doses of 4×1013 and 1.4×1014 ions cm-2 are shown and compared with those determined by Rutherford backscattering.
7 citations
TL;DR: In this article, a new technique of photoacoustic spectroscopy measurements of the absolute fluorescence quantum yields has been investigated and used in laser dye solutions, and five home-made dyes, Rhodamine 6G, Disodium Fluorescein, Eosin Y, Cuomarin 1 and Quinine Bisulphate have been measured.
Abstract: A new technique of photoacoustic spectroscopy measurements of the absolute fluorescence quantum yields has been investigated and used in laser dye solutions. The fluorescence quenchers is used in the experiment. Five home-made dyes, Rhodamine 6G, Disodium Fluorescein, Eosin Y, Cuomarin 1 and Quinine Bisulphate, have been measured. The results are in excellent agreement with those reported.
6 citations
TL;DR: In this article, a formula is provided to check the correlation of pulsars and supernova remnants, using only observable pulsar parameters, and the validity of this formula depends on the assumption that the value of the initial pulsar frequency is much greater than the present value.
Abstract: A formula is provided to check the correlation of pulsars and supernova remnants, using only observable pulsar parameters. The validity of this formula depends on the assumption that the value of the initial pulsar frequency is much greater than the present value. A test for this assumption is suggested.
TL;DR: In this article, the bifurcation and chaos of an 8" cone loudspeaker from its radiation in axial direction have been investigated by adopting an experimental setup quite similar to that of measuring frequency response in an anechois room.
Abstract: The bifurcation and chaos of an 8" cone loudspeaker from its radiation in axial direction have been investigated by adopting an experimental setup quite similar to that of measuring frequency response in an anechois room. Experiments show that lower order and more fractional subharmonics of the fed-in signal begin to appear with increasing input voltage and eventually a chaotic state is reached.
TL;DR: In this paper, the crystallization behavior of a-Pd80Si20 in the high temperature internal friction peak region was systematically studied by DSC and x-ray diffraction techniques.
Abstract: The crystallization behaviour of a-Pd80Si20 in the high temperature internal friction peak region is systematically studied by DSC and x-ray diffraction techniques.
TL;DR: In this paper, the mechanism of optogalvanic effect (OGE) in CO2-N2 discharge was experimentally investigated and it was shown that laser irradiation causes interchange of energies between molecules CO2 and N2 in electronic excited states, and OGE is induced by step-ionization.
Abstract: The mechanism of optogalvanic effect (OGE) in CO2-N2 discharge was experimentally investigated. The results show that laser irradiation causes interchange of energies between molecules CO2 and N2 in electronic excited states, and OGE is induced by step-ionization.
TL;DR: In this article, a comparison of the emission cross sections between two collision systems was conducted, and it was shown that the potential energy defect and the velocity of incident ion are very important factors in emission cross-sections, and a competition process of these factors in collisions occurs.
Abstract: Experimental resutls obtained demonstrate that there are two processes of excitation in every collision system: one is an one-electron capture into excited states, the other is a direct excitation of projectile and target by projectile ion impact. From the comparison of the emission cross sections between the two collision systems, we find that the potential energy defect and the velocity of incident ion are very important factors in emission cross sections, and a competition process of these factors in collisions occurs.
TL;DR: The results of the coincidence experiment which was carried out in the whole month of April, 1985 by two gravitational wave detectors in stanford and in Guangzhou are presented in this paper.
Abstract: The results of coincidence experiment which was carried out in the whole month of April, 1985 by two gravitational wave detectors in stanford and in Guangzhou are presented. It is found that up to sensitivity of h 10-16 the number of coincident events did not excess the number expected statistically.
TL;DR: In this paper, a fully dynamic analysis of a moving defect with a plastic zone is presented, where the fields of stress and displacement of this defect are determined, so that the opening displacement at the tip of the defect is obtained.
Abstract: This letter reports a fully dynamic analysis of a moving defect with a plastic zone. The fields of stress and displacement of this defect are determined, so that the opening displacement at the tip of the defect is obtained. Based on it the author proposes a criterion of nonlinear dynamic fracture of solids.
TL;DR: In this paper, a soft-hard two-component approach to the description of high energy hadronic interactions is proposed, which shows the important role of parton hard scattering in explanation of the chief characteristics of hadronic interaction.
Abstract: A soft-hard two-component approach to the description of high energy hadronic interactions is proposed. It shows the important role of parton hard scattering in explanation of the chief characteristics of high energy hadronic interactions.
TL;DR: In this paper, a high density experiment has been performed by gas puffing on CT-6B tokamak, where the maximum line-averaged electron density achieved is 4×1013cm-3.
Abstract: A high density experiment has been performed by gas puffing on CT-6B tokamak. The changes in the plasma parameters caused by the gas puffing are described. The ionization efficiency measured in the experiment is about 0.5. The dependence of density limit on the injected gas flux is given. The maximum line-averaged electron density achieved is 4×1013cm-3.
TL;DR: In this article, a comparison of SERS excitation profiles of O-nitrobenzoic acid and pyridine coadsorbed on Ag sol has been conducted, and the results show that there must be a nonelectromagnetic enhancement mechanism on SERS.
Abstract: It is proposed in this paper that the comparison experiments on SERS excitation profiles of coadsorbed molecules can provide a critical test of the nature of SERS resonance mechanisms. O-nitrobenzoic acid and pyridine coadsorbed on Ag sol have different resonant maxima in their SERS excitation profiles. Unlike usual excitation experiments on SERS, the results show that there must be a non-electromagnetic enhancement mechanism on SERS.
TL;DR: In this article, the photoacoustic spectra (PAS) of a-Si:H/a-SiNx:H multilayers were measured and the results of quantum size effect in superlattice structure were explained.
Abstract: We present here the first measurement of photoacoustic spectra (PAS) of a-Si:H/a-SiNx:H multilayers. By converting the PAS signal to absorption coefficient, the blue shift and the broadening of Urbach edge are explained as the results of quantum size effect in superlattice structure.
TL;DR: In this article, it was shown that impurity Ti in Si is associated with two electron energy levels Ec - 0.22 eV, Ec − 0.54 eV and one hole energy level Ev + 0.29 eV.
Abstract: DLTS and DDLTS measurements show that impurity Ti in Si is associated with two electron energy levels Ec - 0.22 eV, Ec - 0.54 eV, and one hole energy level Ev + 0.29 eV. The "thermal activation energy" of these two electron energy levels decreases with the increase of the electric field, but that of the hole energy level is independent on electric field. It suggests that these three energy levels should be associated with donor centers.
TL;DR: The induced magnetic ordering effect of polycrystalline dhcp Pr at low temperature was applied to discriminate the minute Pr phase in Pr-Fe-B alloys with high sensitivity as discussed by the authors.
Abstract: The induced magnetic ordering effect of polycrystalline dhcp Pr at low temperature was applied to discriminate the minute Pr phase in Pr-Fe-B alloys with high sensitivity. The conclusion that the composition range of HM phase of Pr-Fe-B is very narrow has been deduced from experiments.
TL;DR: In this article, the effect of phosphorus on defects and resistivity of single crystal wafers treated with double-gettering technique has been investigated by means of optical microscopy, electron microscopy and electron microanalysis.
Abstract: Investigations on the nature and states of the defects in single crystal wafers treated with double-gettering technique have been carried out by means of optical microscopy, electron microscopy, electron microanalysis and spread resistance. Phosphorus profile in these wafers was measured. And the effect of phosphorus on defects and resistivity was determined.
TL;DR: In this article, the superradiance of two level atoms from a lattice of arbitrary dimension is discussed which is resonant sharply with some definite momenta of photons, and both the photon superradiant and the photon trapping (squeezing) from the lattice are expected theoretically.
Abstract: Superradiance of two level atoms from a lattice of arbitrary dimension is discussed which is resonant sharply with some definite momenta of photons. Both the photon superradiant and the photon trapping (squeezing) from the lattice are expected theoretically.
TL;DR: In this paper, the properties of LSW propagation under periodic metal grating have been investigated by using a new method of field analysis that leads to a satisfactory solution fitting the electrical boundary conditions.
Abstract: The properties of LSW propagation under periodic metal grating have been investigated by using a new method of field analysis that leads to a satisfactory solution fitting the electrical boundary conditions. The detailed dispersion relations and the curves of attenuation constant for LSW on 49°Y-X LiNbO3 are presented. The discussion and comparison between the theory and experiment for the first stopband are also made.
TL;DR: In this paper, the broadening of x-ray diffraction peaks has been used successfully to measure the grain sizes of WSi2 in cosputtered W-Si films after annealing.
Abstract: The broadening of x-ray diffraction peaks has been used successfully to measure the grain sizes of WSi2 in cosputtered W-Si films after annealing. The grain size of WSi2 increases with annealing temperature and reaches 115nm afrer annealing at 1000°C. The grain sizes are quite similar to that obtained by transmission electron microscope in electron beam coevaporated film and low pressure chemical vapor deposited film.
TL;DR: In this article, a high-resolution method of source depth estimation in waveguide is proposed based on the mode filtering to get a data set consisting of eigenfunctions, and then the orthogonal decomposition technique is used to process this data set.
Abstract: A high-resolution method of source depth estimation in waveguide is proposed. The method is based on the mode filtering to get a data set consisting of eigenfunctions, and then the orthogonal decomposition technique is used to process this data set. High-resolution depth estimation is obtained even for the shortest data length-only two mode eigenfunctions.
TL;DR: Using pentamethylidyne dye as a saturable absorber, this article obtained pulses close to Fourier-transform limit from colliding pulse mode-locked Nd:YAG and Nd :phosphate glass lasers with minimum pulse durations of 8 psec and 3.7 psec, respectively.
Abstract: Using pentamethylidyne dye as a saturable absorber, we have obtained pulses close to Fourier-transform limit from colliding pulse mode-locked Nd:YAG and Nd:phosphate glass lasers with minimum pulse durations of 8 psec and 3.7 psec, respectively.
TL;DR: In this paper, the authors present preliminary studies of the laser-imploded glass microballons by their newly developed multi-frame x-ray shadowgraphy which is in good agreement with our simulation calculation.
Abstract: We present preliminary studies of the laser-imploded glass microballons by our newly developed multi-frame x-ray shadowgraphy which is in good agreement with our simulation calculation. The study shows that uniform illumination is an important factor for good implosions.