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Papers by Vyacheslav Maslov
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2021
The effect of strong interaction of microwave radiation with very thin conductive fibers has been... more The effect of strong interaction of microwave radiation with very thin conductive fibers has been investigated. The formulas for the absorption and scattering efficiency coefficients are obtained on the basis of the Mie theory. Conditions are found when absorption and scattering are very strong. The fiber diameter should be comparable to the thickness of the skin layer in the fiber. This is about 10 times less than the radiation wavelength in matter. The heat conduction equation, which describes the heating of the fiber by a microwave beam, was solved. The experiment by radiation (λ = 8 mm) was confirmed the theoretical results.
Microwave and Optical Technology Letters, 2021
The possibility for control of tightly focused laser beams excited by the resonator modes of a TH... more The possibility for control of tightly focused laser beams excited by the resonator modes of a THz laser based on a hollow circular dielectric waveguide is studied theoretically and experimentally. The wavelength of the radiation under study is 0.4326 mm corresponding to the generation line of the optically pumped HCOOH‐molecule THz laser. The focusing system is implemented by a short‐focus lens covered by absorbing masks in the central region. The focal area parameters were controlled by changing the size of the masks. The electric field components of the laser modes are calculated using the Rayleigh‐Sommerfeld integral transformations under non‐paraxial approximation. The use of absorbing masks made it possible to reduce the beam diameter in the focal region and increase the depth of focus of the linearly polarized EH11‐mode and azimuthally polarized TE01‐mode as well. In this case, despite of the presence of an absorbing mask, the distribution of the total field intensity of the ...
RADIOFIZIKA I ELEKTRONIKA, 2019
Предмет и цель работы. Теоретически исследованы пространственно-энергетические характеристики лаз... more Предмет и цель работы. Теоретически исследованы пространственно-энергетические характеристики лазерных пучков с неоднородной пространственной поляризацией при их умеренной и острой фокусировке. При численном моделировании фокусировки волновых лазерных пучков в терагерцевом (ТГц) диапазоне в качестве исследуемого излучения использованы моды лазерного резонатора на основе круглого металлического волновода. Данные моды совпадают с собственными типами колебаний такого волновода. Для расчета были выбраны симметричные и несимметричные моды с азимутальной, радиальной и сложной пространственной поляризацией поля. Методы и методология работы. При исследовании распространения компонент электрического поля лазерного излучения в свободном пространстве были использованы интегралы Рэлея-Зоммерфельда в непараксиальном приближении. Влияние фокусирующей линзы на исследуемое излучение учитывалось при помощи функции амплитудно-фазовой коррекции. Изучались поперечные распределения суммарной интенсивности поля и ее отдельных компонент исследуемых резонаторных мод в области минимального размера фокального пятна сфокусированных пучков излучения. Результаты работы. Волновые пучки с неоднородной пространственной поляризацией излучения необходимы для решения важных фундаментальных и прикладных задач, связанных с взаимодействием электромагнитных волн ТГц-диапазона с веществом диагностики поверхности материалов, тонких пленок, биологических объектов, ТГц-систем передачи и обработки информации, достижения субволнового разрешения в ТГц-томографии, в ТГц-системах связи и т. д. Результаты исследований особенностей их фокусировки в ТГц-диапазоне практически отсутствуют. Теоретически исследованы физические особенности умеренной и острой фокусировок лазерных пучков излучения, возбуждаемых модами резонатора с круглым металлическим волноводом и различной пространственной поляризацией поля. Полученные результаты расширяют знания об особенностях фокусировки лазерных пучков ТГц-диапазона. Заключение. Установлены физические особенности пространственно-энергетических характеристик при умеренной и острой фокусировке в свободном пространстве пучков излучения с разной пространственной поляризацией поля, возбуждаемых модами резонатора лазера на основе круглого металлического волновода в ТГц-диапазоне. Ил. 10. Библиогр.: 13 назв.
Telecommunications and Radio Engineering, 2019
Telecommunications and Radio Engineering, 2016
Telecommunications and Radio Engineering, 2002
ABSTRACT The purpose of the given work is study of SMM OPL with the offered transversal mode sele... more ABSTRACT The purpose of the given work is study of SMM OPL with the offered transversal mode selector. The availability of a quasioptical waveguide cavity with the offered transversal mode selector is demonstrated for the creation wide-range small-sized SMM optically pumped lasers. The control of the selector diaphragm diameter is executed without the disturbance of the laser action in any line of oscillation. At that no more than two lower modes remain over the threshold of oscillation. Due to small width of the gain line of SMM laser the single-mode action can be reached, as a rule, by tuning a cavity. The effective high mode suppression is obtained as well in the case of several cavity modes occur within of the gain contour simultaneously.
Telecommunications and Radio Engineering, 2002
Soviet Journal of Quantum Electronics, 1989
A method is developed for calculation of the parameters of waveguide laser resonators (cavities) ... more A method is developed for calculation of the parameters of waveguide laser resonators (cavities) with central apertures of different diameters in reflectors located at the opposite ends. This method is based on expansion of the functions representing the distribution of the field of the resonator modes in terms of distribution functions of oscillation modes propagating in a waveguide laser tube. The method is supported by experimental results and it is used to optimize the output power of submillimeter lasers pumped with TEA CO 2 laser radiation.
Telecommunications and Radio Engineering, 2008
Telecommunications and Radio Engineering, 2015
Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005.
ABSTRACT The mode techniques based on the representation of the input field as a spectrum of prop... more ABSTRACT The mode techniques based on the representation of the input field as a spectrum of propagating modes are proposed for calculating the propagation of radiation in oversized hollow waveguides excited by linearly polarized Gaussian beams. Optimum excitation conditions are determined theoretically and experimentally, and the degree of polarization of the beams transmitted through the waveguides is evaluated.
Quantum Electronics, 2001
ABSTRACT A method of forming non-Gaussian light beams with a uniform spatial intensity distributi... more ABSTRACT A method of forming non-Gaussian light beams with a uniform spatial intensity distribution is studied. It uses a generalised confocal laser cavity, with one of the mirrors made in the form of a mask with discretely arranged phase-shifting nonuniformities. The theoretical and experimental results of the study confirm the formation of such beams at the output of a CO2 laser with a nonuniform phase-stepped mirror.
Laser submillimeter (SMM) interferometers are widely used to diagnose high-temperature plasma in ... more Laser submillimeter (SMM) interferometers are widely used to diagnose high-temperature plasma in thermonuclear installations. The results of a study of a ring SMM laser with bidirectional optical pumping in the formic acid molecule (HCOOH) acting by the oscillation line with the wavelength 393.6 μm and heterodyne interferometer are given. The problem of stabilization of radiation sources in this interferometer is simplified substantially to increase reliability and reduce the cost of the interferometer
Quantum Electronics, 2011
Quantum Electronics, 2001
Absolute differential and integral cross section measurements for electron impact excitation of t... more Absolute differential and integral cross section measurements for electron impact excitation of the dissociativeã 3 B 1 ,b 3 A 1 andB 1 A 1 electronic states of water are described. These are very important channels for the production of OH (X 2 , ν) radicals, as well as for understanding the origin of the atmospheric Meinel bands. The energy range of our measurements is 20-50 eV, with the angular range of the differential cross section data being 10 •-90 •. Where possible comparison of the present cross sections with the corresponding results from theoretical calculations is made, the level of agreement between them being found to be quite marginal.
Quantum Electronics, 2007
Quantum Electronics, 2007
A method for producing non-Gaussian light beams with a uniform intensity proéle is described. The... more A method for producing non-Gaussian light beams with a uniform intensity proéle is described. The method is based on the use of a combined waveguide quasi-optical resonator containing a generalised confocal resonator with an inhomogeneous mirror with absorbing inhomogeneities discretely located on its surface and a hollow dielectric waveguide whose size satisées the conditions of self-imaging of a uniform éeld in it. The existence of quasi-homogeneous beams at the output of an optically pumped 0.1188-mm waveguide CH 3 OH laser with a amplitude-stepped mirror is conérmed theoretically and experimentally.
Quantum Electronics, 2005
The possibility of self-consistent determination of instanton liquid parameters is discussed toge... more The possibility of self-consistent determination of instanton liquid parameters is discussed together with the definition of optimal pseudo-particle configurations and comparing the various pseudo-particle ensembles. The weakening of repulsive interactions between pseudo-particles is argued and estimated.
Quantum Electronics, 2013
We study the linear and nonlinear properties of two-dimensional matter-wave pulses in disk-shaped... more We study the linear and nonlinear properties of two-dimensional matter-wave pulses in disk-shaped superfluid Fermi gases. A Kadomtsev-Petviashvili I (KPI) solitary wave has been realized for superfluid Fermi gases in the limited cases of Bardeen-Cooper-Schrieffer (BCS) regime, Bose-Einstein condensate (BEC) regime, and unitarity regime. Onelump solution as well as one-line soliton solutions for the KPI equation are obtained, and two-line soliton solutions with the same amplitude are also studied in the limited cases. The dependence of the lump propagating velocity and the sound speed of two-dimensional superfluid Fermi gases on the interaction parameter are investigated for the limited cases of BEC and unitarity.
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2021
The effect of strong interaction of microwave radiation with very thin conductive fibers has been... more The effect of strong interaction of microwave radiation with very thin conductive fibers has been investigated. The formulas for the absorption and scattering efficiency coefficients are obtained on the basis of the Mie theory. Conditions are found when absorption and scattering are very strong. The fiber diameter should be comparable to the thickness of the skin layer in the fiber. This is about 10 times less than the radiation wavelength in matter. The heat conduction equation, which describes the heating of the fiber by a microwave beam, was solved. The experiment by radiation (λ = 8 mm) was confirmed the theoretical results.
Microwave and Optical Technology Letters, 2021
The possibility for control of tightly focused laser beams excited by the resonator modes of a TH... more The possibility for control of tightly focused laser beams excited by the resonator modes of a THz laser based on a hollow circular dielectric waveguide is studied theoretically and experimentally. The wavelength of the radiation under study is 0.4326 mm corresponding to the generation line of the optically pumped HCOOH‐molecule THz laser. The focusing system is implemented by a short‐focus lens covered by absorbing masks in the central region. The focal area parameters were controlled by changing the size of the masks. The electric field components of the laser modes are calculated using the Rayleigh‐Sommerfeld integral transformations under non‐paraxial approximation. The use of absorbing masks made it possible to reduce the beam diameter in the focal region and increase the depth of focus of the linearly polarized EH11‐mode and azimuthally polarized TE01‐mode as well. In this case, despite of the presence of an absorbing mask, the distribution of the total field intensity of the ...
RADIOFIZIKA I ELEKTRONIKA, 2019
Предмет и цель работы. Теоретически исследованы пространственно-энергетические характеристики лаз... more Предмет и цель работы. Теоретически исследованы пространственно-энергетические характеристики лазерных пучков с неоднородной пространственной поляризацией при их умеренной и острой фокусировке. При численном моделировании фокусировки волновых лазерных пучков в терагерцевом (ТГц) диапазоне в качестве исследуемого излучения использованы моды лазерного резонатора на основе круглого металлического волновода. Данные моды совпадают с собственными типами колебаний такого волновода. Для расчета были выбраны симметричные и несимметричные моды с азимутальной, радиальной и сложной пространственной поляризацией поля. Методы и методология работы. При исследовании распространения компонент электрического поля лазерного излучения в свободном пространстве были использованы интегралы Рэлея-Зоммерфельда в непараксиальном приближении. Влияние фокусирующей линзы на исследуемое излучение учитывалось при помощи функции амплитудно-фазовой коррекции. Изучались поперечные распределения суммарной интенсивности поля и ее отдельных компонент исследуемых резонаторных мод в области минимального размера фокального пятна сфокусированных пучков излучения. Результаты работы. Волновые пучки с неоднородной пространственной поляризацией излучения необходимы для решения важных фундаментальных и прикладных задач, связанных с взаимодействием электромагнитных волн ТГц-диапазона с веществом диагностики поверхности материалов, тонких пленок, биологических объектов, ТГц-систем передачи и обработки информации, достижения субволнового разрешения в ТГц-томографии, в ТГц-системах связи и т. д. Результаты исследований особенностей их фокусировки в ТГц-диапазоне практически отсутствуют. Теоретически исследованы физические особенности умеренной и острой фокусировок лазерных пучков излучения, возбуждаемых модами резонатора с круглым металлическим волноводом и различной пространственной поляризацией поля. Полученные результаты расширяют знания об особенностях фокусировки лазерных пучков ТГц-диапазона. Заключение. Установлены физические особенности пространственно-энергетических характеристик при умеренной и острой фокусировке в свободном пространстве пучков излучения с разной пространственной поляризацией поля, возбуждаемых модами резонатора лазера на основе круглого металлического волновода в ТГц-диапазоне. Ил. 10. Библиогр.: 13 назв.
Telecommunications and Radio Engineering, 2019
Telecommunications and Radio Engineering, 2016
Telecommunications and Radio Engineering, 2002
ABSTRACT The purpose of the given work is study of SMM OPL with the offered transversal mode sele... more ABSTRACT The purpose of the given work is study of SMM OPL with the offered transversal mode selector. The availability of a quasioptical waveguide cavity with the offered transversal mode selector is demonstrated for the creation wide-range small-sized SMM optically pumped lasers. The control of the selector diaphragm diameter is executed without the disturbance of the laser action in any line of oscillation. At that no more than two lower modes remain over the threshold of oscillation. Due to small width of the gain line of SMM laser the single-mode action can be reached, as a rule, by tuning a cavity. The effective high mode suppression is obtained as well in the case of several cavity modes occur within of the gain contour simultaneously.
Telecommunications and Radio Engineering, 2002
Soviet Journal of Quantum Electronics, 1989
A method is developed for calculation of the parameters of waveguide laser resonators (cavities) ... more A method is developed for calculation of the parameters of waveguide laser resonators (cavities) with central apertures of different diameters in reflectors located at the opposite ends. This method is based on expansion of the functions representing the distribution of the field of the resonator modes in terms of distribution functions of oscillation modes propagating in a waveguide laser tube. The method is supported by experimental results and it is used to optimize the output power of submillimeter lasers pumped with TEA CO 2 laser radiation.
Telecommunications and Radio Engineering, 2008
Telecommunications and Radio Engineering, 2015
Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005.
ABSTRACT The mode techniques based on the representation of the input field as a spectrum of prop... more ABSTRACT The mode techniques based on the representation of the input field as a spectrum of propagating modes are proposed for calculating the propagation of radiation in oversized hollow waveguides excited by linearly polarized Gaussian beams. Optimum excitation conditions are determined theoretically and experimentally, and the degree of polarization of the beams transmitted through the waveguides is evaluated.
Quantum Electronics, 2001
ABSTRACT A method of forming non-Gaussian light beams with a uniform spatial intensity distributi... more ABSTRACT A method of forming non-Gaussian light beams with a uniform spatial intensity distribution is studied. It uses a generalised confocal laser cavity, with one of the mirrors made in the form of a mask with discretely arranged phase-shifting nonuniformities. The theoretical and experimental results of the study confirm the formation of such beams at the output of a CO2 laser with a nonuniform phase-stepped mirror.
Laser submillimeter (SMM) interferometers are widely used to diagnose high-temperature plasma in ... more Laser submillimeter (SMM) interferometers are widely used to diagnose high-temperature plasma in thermonuclear installations. The results of a study of a ring SMM laser with bidirectional optical pumping in the formic acid molecule (HCOOH) acting by the oscillation line with the wavelength 393.6 μm and heterodyne interferometer are given. The problem of stabilization of radiation sources in this interferometer is simplified substantially to increase reliability and reduce the cost of the interferometer
Quantum Electronics, 2011
Quantum Electronics, 2001
Absolute differential and integral cross section measurements for electron impact excitation of t... more Absolute differential and integral cross section measurements for electron impact excitation of the dissociativeã 3 B 1 ,b 3 A 1 andB 1 A 1 electronic states of water are described. These are very important channels for the production of OH (X 2 , ν) radicals, as well as for understanding the origin of the atmospheric Meinel bands. The energy range of our measurements is 20-50 eV, with the angular range of the differential cross section data being 10 •-90 •. Where possible comparison of the present cross sections with the corresponding results from theoretical calculations is made, the level of agreement between them being found to be quite marginal.
Quantum Electronics, 2007
Quantum Electronics, 2007
A method for producing non-Gaussian light beams with a uniform intensity proéle is described. The... more A method for producing non-Gaussian light beams with a uniform intensity proéle is described. The method is based on the use of a combined waveguide quasi-optical resonator containing a generalised confocal resonator with an inhomogeneous mirror with absorbing inhomogeneities discretely located on its surface and a hollow dielectric waveguide whose size satisées the conditions of self-imaging of a uniform éeld in it. The existence of quasi-homogeneous beams at the output of an optically pumped 0.1188-mm waveguide CH 3 OH laser with a amplitude-stepped mirror is conérmed theoretically and experimentally.
Quantum Electronics, 2005
The possibility of self-consistent determination of instanton liquid parameters is discussed toge... more The possibility of self-consistent determination of instanton liquid parameters is discussed together with the definition of optimal pseudo-particle configurations and comparing the various pseudo-particle ensembles. The weakening of repulsive interactions between pseudo-particles is argued and estimated.
Quantum Electronics, 2013
We study the linear and nonlinear properties of two-dimensional matter-wave pulses in disk-shaped... more We study the linear and nonlinear properties of two-dimensional matter-wave pulses in disk-shaped superfluid Fermi gases. A Kadomtsev-Petviashvili I (KPI) solitary wave has been realized for superfluid Fermi gases in the limited cases of Bardeen-Cooper-Schrieffer (BCS) regime, Bose-Einstein condensate (BEC) regime, and unitarity regime. Onelump solution as well as one-line soliton solutions for the KPI equation are obtained, and two-line soliton solutions with the same amplitude are also studied in the limited cases. The dependence of the lump propagating velocity and the sound speed of two-dimensional superfluid Fermi gases on the interaction parameter are investigated for the limited cases of BEC and unitarity.