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Vladimir. Dmitrievich. Golyshev

Vladimir. Dmitrievich. Golyshev
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60
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Publications

Publications (60)
Article
Full-text available
The crystal quality in many respects depends on the conditions of heat?mass transfer forming the concentration field near the crystallization front and its shape. It is especially difficult to control heat?mass transfer during the growth of large-diameter crystals. In the conventional methods of growth of large-diameter crystals, the intensity of t...
Article
Full-text available
The results of in situ measurements of dependence of growth rate on supercooling of the Bi4Ge3O12 (BGO) interface are presented. Supercooling was measured with an optical pyrometer through the growing crystal. The features of interfacial kinetics for (211) and (110) facets are described. The correlation between results of characterization and data...
Article
The X-ray sensitivity of Cd0.9Zn0.1Te detectors as a function of the effective X-ray energy and bias voltage is studied. It is shown that the sensitivity grows with effective X-ray energy and much more significantly with bias voltage. The sensitivity depends on the angle the X-ray beam makes with an electric field in the detector. In the energy ran...
Article
The present work describes the results of spectral absorptivity, α, and thermal conductivity, λ, studies for compound oxides Bi4Ge3O12, Bi12GeO20, Bi4Si3O12, and Bi12SiO20 in molten and monocrystalline states. The data for the spectral absorptivity were obtained by placing the sample onto a mirror and using the transmission method. To obtain the da...
Article
Spin macroscopic quantum coherent (MQC) states of fine antiferromagnetic particles in a magnetic field acting perpendicular to its easy axis are analysed. Field oscillations of frequency of spin macroscopic quantum tunnelling (MQT) between degenerative energy states originated from instanton interference in magnetic field are predicted. The periodi...
Article
An antimony-doped germanium single crystals were grown by the axial heat processing (AHP) method for experimental–numerical research of faceting of melt/crystal interface. The comparing of experimental and numerical results has shown the high accuracy of determination of heat and mass transfer during faceted Ge AHP crystal growth at using of the no...
Article
The paper is devoted to the mathematical modeling of problems of growth of CdZnTe (CZT) crystals at high-pressure inert atmosphere by a crystal growth method during which an axial heat flux close to the phase interface is applied (AHP-method) [V. Golyshev, M. Gonik, Patent of RF # 180085415, 1990]. The AHP-method is a modification of the Bridgman m...
Article
The influence of the absorption coefficient α of a growing crystal on the accuracy of determination of supercooling ΔT at the crystal-melt interface has been studied. The value of ΔT is determined from the brightness temperature Tb of the interface measured by an optical pyrometer through the crystal. It is shown that the absorption coefficient α,...
Article
Optical nonlinear effects of self-phase and cross-phase modulation and stimulated Brillouin scattering (SBS) determining the data transmission quality in fibreoptic communication lines are studied. The Stokes radiation power upon SBS is calculated taking into account the nonlinear broadening of the optical signal spectrum caused by self-phase modul...
Article
Full-text available
Combined experimental and numerical tools are developed and used to define more exactly the growth kinetic relations for (211) crystallographic orientation of Bi4Ge3O12 (BGO) crystal growth—namely, the dependence of crystal growth rate V on supercooling, ΔT of the melt/crystal interface. A new apparatus for in situ measurements of the time dependen...
Article
An antimony-doped germanium single crystal was grown by the Axial Heat Processing (AHP) method from the melt to study the influence of facets on the morphological stability of a solid/liquid interface. It is shown that the faceted portion of the interface remains more stable than the non-faceted portion. In addition, instability of the faceted regi...
Article
To investigate a weak melt flow effect on the segregation process, the axial heat processing crystal growth technique was used at conditions of low-frequency temperature fluctuations. This technique was applied to Te-doped GaSb crystal growth. A two-dimensional transient numerical model based on the “KARMA1” computer code was developed to investiga...
Article
Stimulated Mandelstam-Brillouin scattering (SMBS) is experimentally studied in a fiber-optic communication line at a high power of the transmitted signal. The SMBS threshold is not observed at a power of up to 400 mW, which is due to an alternative nonlinear effect (self-phase-modulation (SPM)). An analytical model of SMBS in a single-mode fiber is...
Article
Combined experimental and numerical tools are used to analyze the effect of convective and radiative heat transport, faceting phenomena, and the optical thickness of the Bi4Ge3O12 (BGO) crystal on the measurement and calculation of melt/crystal interface kinetics during the axial heat flux close to the phase interface growth of BGO single crystals....
Article
The possibility of growing macrohomogeneous Ga1 − x InxSb crystals with x = 0.2 was studied using the axial heating process close to the melt/crystal interface. The grown ingots were analyzed by a JSM-5300 scanning electron microscope and the experimental results were compared with the results of numerical simulation. It was shown that, as a whole,...
Article
Thermal conductivity and spectral absorption coefficient of bismuth germanate Bi4Ge3O12 are measured in crystalline state and in melt within temperature range 750–1350K. It is discovered that thermal conductivity of the melt is low and close to those of thermal insulation (0.2W/mK). Thermal conductivity of the crystal at melting point is not high;...
Article
Experimental and calculation investigations of the features of radiative–conductive heat transfer during the growth of bismuth germanate (Bi4Ge3O12) single crystals are carried out. It is demonstrated that due to the radiative–conductive character of heat transfer, the temperature regime of the crystallization of perfect crystals has non-convention...
Article
An antimony-doped germanium single crystal was grown by the axial heat processing (AHP) method from the melt to study the influence of facets on the morphological stability of a solid/liquid interface. A mathematical model together with experimental data was utilized to predict the solute concentration and stability in the grown crystal. It is show...
Article
Stimulated Raman scattering (SRS) in a long-distance fiber-optic communication line with wavelength-division multiplexing (WDM) is studied theoretically at a high power of the signal transmitted. A new criterion for determining the SRS threshold is used to calculate the critical input power versus the number of optical channels and frequency separa...
Article
The amplification of an optical signal in an erbium-and ytterbium-doped fiber saturation-mode amplifier is considered. Analytical distributions of the inverse population, pump power, and signal intensity along an active light guide are derived. Spectral dependences of the saturation power and amplification threshold are obtained for different mode...
Conference Paper
Full-text available
Successful processing of homogeneous semiconductor single crystals from their melts depends strongly on precise control of thermal and fluid flow conditions near the solid/liquid interface. In this project, we utilize a novel crystal growth technique called Axial Heat Processing (AHP) that uses a baffle, positioned inside the melt near the interfac...
Article
Full-text available
Methods of measuring the thermal conductivity of materials in solid and liquid state at high temperatures are reviewed. Factors influencing the accuracy of the obtained results are examined. Special attention is paid to the role of contact resistance. Results for the thermal conductivity of sodium chloride, bismuth germanate, and germanium over a w...
Article
The in situ measurement of interface supercooling in Bi4Ge3O12 (BGO) during melt crystal growth was performed. The monocrytsalline sample of BGO had plane parallel polished end faces and was oriented in the crystallographic direction. The method of measuring of the interface temperature using optical pyrometer in the presence of several facets with...
Article
The possibility of obtaining the well-known weakly forced melt flow along the melt–crystal interface is studied. It is shown that the well-known laminar-forced melt flow can be provided during crystallization by a method of crystal growth in an axial heat flux close to the phase interface (AHP method). The calculations of the 2D transient problem o...
Article
The time evolution of the full density matrix was studied for a quantum system comprising a quantum harmonic oscillator in a dissipative environment described by a system of oscillators. The problem was solved in the case of a frequency-independent ohmic dissipation for the oscillator in the ground state at the initial time instant.
Conference Paper
The quality of semiconductor single crystals grown from a melt depends strongly on the thermal conditions and fluid dynamics near the solid/liquid interface. A novel crystal growth technique called Axial Heat Processing (AHP) enables close control of geometrical and thermal conditions near the interface. This technique involves the use of a baffle...
Article
The major focus of this investigation is to study the fundamentals of layer spreading mechanisms during growth of doped Ge (a facet forming material), and to determine the conditions for morphological instability of vicinal solid-liquid interfaces. The investigation will also lead to the determination of the effect of dopants on the layer growth ki...
Article
Results of experimental research on the thermal conductivity for sodium chloride melt are described. Analysis of these data and data obtained by other authors is given. The mean value calculated from data of different studies is 0.41 W m(-1) K-1. The overall accuracy of this value is estimated to be +/-7%. The influence of the experimental conditio...
Article
The results of in situ measurements of supercooling of the interface during the growth of Bi4Ge3O12 single crystal from melt are presented. Supercooling was determined by measuring the intensity of intrinsic thermal radiation from the interface, which was recorded with an optical pyrometer through the growing crystal. The dependence of growth rate...
Article
The results of determination of the supercooling dependence at the interphase boundary on the rate of growth from melt of the monocrystal Bi4Ge3O12 in the [211] direction are presented. Determination of supercooling was based on optical pyrometer measurements of the intensity of heat emission from the interphase boundary through the growing crystal...
Article
A brief description and analysis of methods concerning the determination of the dependence of interface supercooling on the growth rate during Bi4Ge3O12 single crystal growth from the melt are given. The supercooling measurement is based on determination of the thermal radiation intensity of the interface by an optical pyrometer through the growing...
Article
We demonstrate the potentialities of a direct method for evaluating melt supercooling, in which the intensity of thermal radiation from the solidification interface is measured with an optical pyrometer through the growing crystal. With this method, the temperature of the crystal-melt interface can be assessed. Experimental data are presented on th...
Article
The application of the crucibleless method for the growth of dielectric crystals from the melt is studied. This method is a variant of crystal growth in an axial heat flux close to the phase interface (AHP method). A special AHP-heater placed in the melt close to the growing crystal allowed the creation of a planar interface over practically the wh...
Article
The experimental technique and equipment for measuring the interface supercooling during growth of dielectric single crystals from a melt are described. The supercooling is measured by a pyrometer from the intensity of thermal radiation of the interface that is recorded through the growing crystal. Bismuth germanate (Bi4Ge3O12) is chosen as an obje...
Article
The influence of spin coupling with atomic lattice vibrations on the macroscopic quantum tunneling (MQT) dynamics is analyzed for a small magnetic particle. The probability of conservation of the initial state is calculated by the Feynman-Vernon method taking into account topological effects of Néel vector tunneling in a rhombic antiferromagnet. It...
Article
Calculations are made for the dynamic susceptibility of a weakly ferromagnetic mesoparticle in the macroscopic quantum coherence region and the probability of conservation of the initial polarized state in a pulsed magnetic field.
Article
The ground-state splitting due to macroscopic quantum tunneling (MQT) of the Néel vector in a weakly ferromagnetic fine particle in an external magnetic field is calculated. The fluctuation contribution to the Feynman path integral is taken into account. It is shown that the rate of MQT can oscillate due to instanton interference in the break antif...
Article
We describe the methods of experimental investigations of radioactive-conductive heat transfer in the process of growing single crystals. The methods are based on the establishment (in the process of the growth of makers) of the position and shape of the crystallization front and comparison of this position with the calculated position of the melti...
Article
Requirements of methods for measuring thermal conductivity in the presence of combined radiative-conductive heat transfer and the optical constants of melts, in the temperature range 300-2500°K, are stated. Appropriate apparatus is described. The data on the absorptivity in a spectra range of 1-15 micrometers and on the thermal conductivity of a wi...
Article
Experimental data on the thermal conductivity of pure melts of some chlorides, fluorides, silicates, and oxides are cited. Data of different authors are compared. The NaCl melt is suggested for use as a standard melt, with the recommended value of the thermal conductivity being equal to 0.433 W m-1 K-1. The possibility of a theoretical determinatio...
Article
Experimental equipment and procedures for studying radiative-conductive heat transfer in melts are described, with particular attention given to an apparatus for measuring the optical properties of melts and the coaxial cylinder method for measuring the heat conductivity of melts. Experimental data are then presented on the heat conductivity and sp...
Article
A description is given of the optical system which employs two identical projection-type reflecting objectives, with the over-all magnification and the matching between the light source and monochromator not disrupted. One can use any spectrometer that allows the illuminator to be separated from the monochromator. The experimental results were obta...
Article
A theoretical analysis is made of radiative-conductive heat transfer (RCT) in planar and cylindrical layers of an absorbing and radiating substance with opaque boundaries. Conditions are established for calculation of the thermal conductivity of translucent melts from experimental data obtained in a cylindrical cell on the basis of solution of the...
Article
The present work describes the results of researching spectral absorptivity and thermal conductivity of compound oxides Bi12GeO20, Bi4Si3O12 and Bi12SiO20 in molten and monocrystalline state. The data on spectral absorptivity was obtained by using the method of placing the sample on the mirror and by the transmission method. To obtain the data on t...
Article
Construction and parameters of an optical high-resolution pyrometer, designed for interface supercooling ∆T measurement, are described. Supercooling is determined by measuring of interface brightness temperature Тb through the growing semitransparent crystal. The results of in situ supercooling measurement at Bi3Ge4O12 crystal growth from melt, obt...
Article
Full-text available
Introduction. Widely recognized methods for single crystal growth are known to be characterized by a complex, instable in behavior melt flow, appearing at the interaction of buoyancy, thermocapillary and forced convections. Previously, some methods of growth have been proposed (1, 2) when an additional heater is arranged inside the crucible, in the...