Труды сотрудников ИВМ СО РАН

[Text] : статья / A.P. Gavrilyuk, I.V. Krasnov, Shaparev N.Ya. // Laser Physics. - 2005. - Vol. 15, № 7. - p. 1102–1107

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Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич; Shaparev, N.Ya.; Шапарев, Николай Якимович; Гаврилюк, Анатолий Петрович

[Text] : статья / I.V. Krasnov // JETP. - 1987. - Vol. 65, № 4. - p. 708-714

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Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Краснов, Игорь Васильевич

[Текст] : статья / A. P. Gavrilyuk [и др.] // Russian Physics Journal. - 1999. - Vol. 42, № 8
Аннотация: The results obtained by the authors in studies of the mechanical action of resonance laser light on gas and plasma are briefly reviewed.

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Gavrilyuk, A.P.; Гаврилюк, Анатолий Петрович; Krasnov, I.V.; Краснов, Игорь Васильевич; Polyutov, S.P.; Shaparev, N.Ya.; Шапарев, Николай Якимович

[Text] : статья / I.V. Krasnov // Journal of Experimental and Theoretical Physics. - 1995. - Vol. 80, № 4. - p. 632-641 ; Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki. - 1995. - Vol. 107. - p. 1135-1152
Аннотация: The possibility is demonstrated of using intense interfering light fields to form a bulk, rectified, induced-light-pressure force, thereby making it possible to efficiently act on transport phenomena of a small resonant admixture in a buffer gas. This force is capable of inducing rotating or fixed spatially periodic structures in a dense gas. The symmetry and other characteristics of such a sharp periodic stratification of the gas are extremely sensitive to the spatial configuration, phases, and parameters of the fields acting on it.

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Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Краснов, Игорь Васильевич

[Text] : статья / A.P. Kazantsev, I.V. Krasnov // Journal of Experimental and Theoretical Physics. - 1989. - Vol. 68, № 1. - p. 59-64 ; Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki. - 1989. - Vol. 95. - p. 104-113
Аннотация: The possibility is demonstrated of using intense interfering light fields to form a bulk, rectified, induced-light-pressure force, thereby making it possible to efficiently act on transport phenomena of a small resonant admixture in a buffer gas. This force is capable of inducing rotating or fixed spatially periodic structures in a dense gas. The symmetry and other characteristics of such a sharp periodic stratification of the gas are extremely sensitive to the spatial configuration, phases, and parameters of the fields acting on it.

Полный текст на сайте журнала

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич

[Text] : статья / A.P. Kazantsev, I.V. Krasnov // Journal of the Optical Society of America B. - 1989. - Vol. 6, № 11. - p. 2140-2148DOI: 10.1364/JOSAB.6.002140 . -
Аннотация: A radiation-pressure force, changing only slightly within the wavelength of light (rectification effect), has been shown to arise in interfering fields. In a monochromatic field a rectified force (RF) has the scale of a spontaneous light-pressure force, and it is mainly a vortex one. In a bichromatic field the RF has the order of magnitude of the induced light-pressure force and does saturate in a strong field. The spatial RF structure can be either potential or rotational. The depth of the potential wells generated by the RF can exceed by several orders of magnitude the energy of the atom-field interaction, and it can reach 10 K and larger. A vortex periodic RF results either in regular rotating motion or in a random walk of atoms along the boundaries of elementary cells of the force field. Possible applications of the RF are discussed.

Держатели документа:
ИВМ СО РАН : 660036, Красноярск, Академгородок, 50, стр.44

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич

/ N.M. Mineyeva, L.A. Shchur, N.A. Bondarenko // Hydrobiological Journal. - 2012. - Vol. 48, Is. 5. - pp. 19-30, DOI 10.1615/HydrobJ.v48.i5.20 . - ISSN 0018-8166
Аннотация: Comparative analysis of the functional characteristics of phytoplankton of the Baikal and Khanka lakes, and also of the reservoirs of the Volga and Yenisey rivers, differing in their energetic and mineral resources has shown that their algae cenoses differ in the dimensional composition of dominant species. It has been found that the development of phytoplankton depends on the content of nutrients, its photosynthesizing activity - on the content of nutrients and light regime, whereas the intensity and relationship between the processes of production and decomposition - on hydrological conditions and morphometric peculiarities of water bodies. В© 2012 Begell House, Inc.

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Доп.точки доступа:
Mineyeva, N.M.; Shchur, L.A.; Щур, Людмила Александровна; Bondarenko, N.A.

[Text] / N.I. Kosarev, N.Y. Shaparev // Quantum Electron. - 2009. - Vol. 39, Is. 12. - pp. 1112-1116, DOI 10.1070/QE2009v039n12ABEH014094. - Cited References: 13 . - ISSN 1063-7818РУБ Engineering, Electrical & Electronic + Physics, Applied

Аннотация: We report a computer simulation study of light absorption, scattering and emission at 397 nm in an ultracold calcium ion plasma under resonant excitation. The results point to spectral asymmetry of light scattering, nonlinear absorption, and emission in the plasma. An approach is proposed for ultracold plasma diagnostics using resonant optical characteristics.


Доп.точки доступа:
Shaparev, N.Ya.; Шапарев, Николай Якимович; Косарев Н.И.

/ A. E. Ershov [et al.] // Applied Physics B: Lasers and Optics. - 2013. - P1-14, DOI 10.1007/s00340-013-5636-6 . - ISSN 0946-2171
Аннотация: We propose an optodynamical model of interaction of pulsed laser radiation with aggregates of spherical metallic nanoparticles embedded into host media. The model takes into account polydispersity of particles, pair interactions between the particles, dissipation of absorbed energy, heating and melting of the metallic core of particles and of their polymer adsorption layers, and heat exchange between electron and ion components of the particle material as well as heat exchange with the interparticle medium. Temperature dependence of the electron relaxation constant of the particle material and the effect of this dependence on interaction of nanoparticles with laser radiation are first taken into consideration. We study in detail light-induced processes in the simplest resonant domains of multiparticle aggregates consisting of two particles of an arbitrary size in aqueous medium. Optical interparticle forces are realized due to the light-induced dipole interaction. The dipole moment of each particle is calculated by the coupled dipole method (with correction for the effect of higher multipoles). We determined the role of various interrelated factors leading to photomodification of resonant domains and found an essential difference in the photomodification mechanisms between polydisperse and monodisperse nanostructures. © 2013 Springer-Verlag Berlin Heidelberg.

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Держатели документа:
L.V. Kirenski Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Computational Modeling, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660028, Russian Federation
ИФ СО РАН
ИВМ СО РАН

Доп.точки доступа:
Ershov, A.E.; Gavrilyuk, A.P.; Гаврилюк, Анатолий Петрович; Karpov, S.V.; Semina, P.N.

[Text] / H. Lammer [et al.] // Planet Space Sci. - 2006. - Vol. 54, Is. 13-14. - P1445-1456, DOI 10.1016/j.pss.2006.04.022. - Cited References: 93 . - ISSN 0032-0633РУБ Astronomy & Astrophysics

Аннотация: Atmospheric escape from the upper atmosphere of Venus is mainly influenced by the loss of hydrogen and oxygen caused by the interaction of solar radiation and particle flux with the unprotected planetary environment. Because one main aim of the ASPERA-4 particle/plasma and VEX-MAG magnetic field experiments on board of ESA's forthcoming Venus Express mission is the investigation of atmospheric erosion processes from the planet's ionosphere-exosphere environment, we study the total loss of hydrogen and oxygen and identified the efficiency of several escape mechanisms involved. For the estimation of pick up loss rates we use a gas dynamic test particle model and obtained average loss rates for H+, and O+ pick up ions of about 1 x 10(25) s(-1) and about 1.6 x 10(25) s(-1), respectively. Further, we estimate ion loss rates due to detached plasma clouds, which were observed by the pioneer Venus orbiter and may be triggered by the Kelvin-Helmholtz instability of about 0.5-1 x 10(25) s(-1). Thermal atmospheric escape processes and atmospheric loss by photo-chemically produced oxygen atoms yield negligible loss rates. Sputtering by incident pick up O+ ions give O atom loss rates in the order of about 6 x 10(24) s(-1). On the other hand, photo-chemically produced hot hydrogen atoms are a very efficient loss mechanism for hydrogen on Venus with a global average total loss rate of about 3.8 x 10(25) s(-1), which is in agreement with Donahue and Hartle [1992. Solar cycle variations in H+ and D+ densities in the Venus ionosphere: implications for escape. Geophys. Res. Lett. 12, 2449-2452] and of the same order but less than the estimated H+ ion outflow on the Venus nightside of about 7.0 x 10(25) s(-1) due to acceleration by an outward electric polarization force related to ionospheric holes by Hartle and Grebowsky [1993. Light ion flow in the nightside ionosphere of Venus. J. Geophys. Res. 98, 7437-7445]. Our study indicates that on Venus, due to its larger mass and size compared to Mars, the most relevant atmospheric escape processes of oxygen involve ions and are caused by the interaction with the solar wind. The obtained results indicate that the ratio between H/O escape to space from the Venusian upper atmosphere is about 4, and is in a much better agreement with the stoichiometrically H/O escape ratio of 2:1, which is not the case on Mars. However, a detailed analysis of the outflow of ions from the Venus upper atmosphere by the ASPERA-4 and VEX-MAG instruments aboard Venus Express will lead to more accurate atmospheric loss estimations and a better understanding of the planet's water inventory. (c) 2006 Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Lammer, H.; Lichtenegger, H.I.M.; Biernat, H.K.; Erkaev, N.V.; Еркаев, Николай Васильевич; Arshukova, I.L.; Kolb, C.; Gunell, H.; Lukyanov, A.; Holmstrom, M.; Barabash, S.; Zhang, T.L.; Baumjohann, W.

[Text] / N. I. Kosarev, N. J. Shaparev // J. Phys. B-At. Mol. Opt. Phys. - 2008. - Vol. 41, Is. 23. - Ст. 235701, DOI 10.1088/0953-4075/41/23/235701. - Cited References: 12 . - ISSN 0953-4075РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: The problem of absorption and scattering of resonance laser radiation in ultracold optical dense plasma has been studied numerically. The frequency asymmetry of scattering and nonlinear absorption of light is predicted.


Доп.точки доступа:
Shaparev, N.Ya.; Шапарев, Николай Якимович

[Text] / A. E. Ershov [et al.] // Appl. Phys. B-Lasers Opt. - 2014. - Vol. 115, Is. 4. - P. 547-560, DOI 10.1007/s00340-013-5636-6. - Cited References: 48. - Authors are thankful to Prof. V. A. Markel (University of Pennsylvania) for supplying program codes for realization of the coupled dipole method for polydisperse metal nanoparticle aggregates. This research was supported by the Russian Academy of Sciences under the Grants 24.29, 24.31, III.9.5, 43, SB RAS-SFU (101); Ministry of Education and Science of Russian Federation under Contract 14.B37.21.0457. . - ISSN 0946-2171. - ISSN 1432-0649РУБ Optics + Physics, Applied

Аннотация: We propose an optodynamical model of interaction of pulsed laser radiation with aggregates of spherical metallic nanoparticles embedded into host media. The model takes into account polydispersity of particles, pair interactions between the particles, dissipation of absorbed energy, heating and melting of the metallic core of particles and of their polymer adsorption layers, and heat exchange between electron and ion components of the particle material as well as heat exchange with the interparticle medium. Temperature dependence of the electron relaxation constant of the particle material and the effect of this dependence on interaction of nanoparticles with laser radiation are first taken into consideration. We study in detail light-induced processes in the simplest resonant domains of multiparticle aggregates consisting of two particles of an arbitrary size in aqueous medium. Optical interparticle forces are realized due to the light-induced dipole interaction. The dipole moment of each particle is calculated by the coupled dipole method (with correction for the effect of higher multipoles). We determined the role of various interrelated factors leading to photomodification of resonant domains and found an essential difference in the photomodification mechanisms between polydisperse and monodisperse nanostructures.

WOS,
Scopus

Держатели документа:
[Ershov, A. E.
Karpov, S. V.
Semina, P. N.] Russian Acad Sci, LV Kirenski Inst Phys, Krasnoyarsk 660036, Russia
[Gavrilyuk, A. P.] Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
[Gavrilyuk, A. P.
Karpov, S. V.] Siberian Fed Univ, Krasnoyarsk 660028, Russia
ИФ СО РАН
ИВМ СО РАН

Доп.точки доступа:
Ershov, A.E.; Gavrilyuk, A.P.; Гаврилюк, Анатолий Петрович; Karpov, S.V.; Semina, P.N.; Russian Academy of Sciences [24.29, 24.31, III.9.5, 43, SB RAS-SFU (101)]; Ministry of Education and Science of Russian Federation [14.B37.21.0457]

/ A. P. Kazantsev, I. V. Krasnov // Phys. Lett. A. - 1988. - Vol. 127, Is. 1. - P33-36, DOI 10.1016/0375-9601(88)90960-7. - Cited References: 15 . - ISSN 0375-9601РУБ Physics, Multidisciplinary

Аннотация: A force of light pressure of a new type is found. This force allows one to form superdeep potential wells resulting in the localization of atoms or a vortex field of forces causing a rotation of particles. В© 1988.

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Scopus

Держатели документа:
ACAD SCI USSR,CTR COMP,KRASNOYARSK,USSR
ИВМ СО РАН
L.D. Landau Institute for Theoretical Physics, Moscow, Russian Federation
Computer Center, the Siberian Department, the Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
KAZANTSEV, A.P.; KRASNOV, I.V.; Краснов, Игорь Васильевич

/ I. V. Krasnov, N. Ya. Shaparev // Optics and Spectroscopy (English translation of Optika i Spektroskopiya). - 1996. - Vol. 80, Is. 4. - P577-580 . - ISSN 0030-400X
Аннотация: Collective ion interactions are shown to considerably change the usual physical picture of bunching of the resonant particle velocities by the force of spontaneous light pressure. This manifests itself in the direct destruction of the process of bunching the ion velocities and the appearance of an overthermal structure in the spectrum of plasma noises. In this case, the spectral density of noises as a function of the phase velocity of plasma waves proves to be a mapping of the optical absorption spectrum and resolves the sub-Doppler structure of the optical resonance.

Scopus

Держатели документа:
Computer Center, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660062, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич; Shaparev, N.Ya.; Шапарев, Николай Якимович

/ A. P. Gavrilyuk // Russian Physics Journal. - 1998. - Vol. 41, Is. 6. - P511-516 . - ISSN 1064-8887
Аннотация: A model is considered for the interaction with plasma of an "optical membrane " formed by bichromatic intersecting laser beams. This model is used to describe a number of effects resulting from the mechanical action of light on resonant ions in the plasma. В© 1999 Kluwer Academic/Plenum Publishers.

Scopus

Держатели документа:
Krasnoyarsk Computing Center, Siberian Branch of the Russian Academy of Sciences, Russian Federation
ИВМ СО РАН

Доп.точки доступа:
Gavrilyuk, A.P.; Гаврилюк, Анатолий Петрович

/ Y. V. Barkhatov [et al.] ; ed.: Z Yang, Z Yang // 18TH BIENNIAL ISEM CONFERENCE ON ECOLOGICAL MODELLING FOR GLOBAL CHANGE AND COUPLED HUMAN AND NATURAL SYSTEM. Ser. Procedia Environmental Sciences : ELSEVIER SCIENCE BV, 2012. - Vol. 13: 18th Biennial ISEM Conference on Ecological Modelling for Global Change and Coupled Human and Natural Systems (SEP 20-23, 2011, Beijing, PEOPLES R CHINA). - P. 621-625, DOI 10.1016/j.proenv.2012.01.053. - Cited References: 17 . - ISBN 1878-0296РУБ Ecology + Environmental Sciences

Аннотация: Difficulties in estimating terrestrial ecosystem CO2 fluxes on regional scales have significantly limited our understanding of the global carbon cycle. We present a method of using tall-tower-based CO2 concentrations for estimating CO2 fluxes over a forested region. With long-term measurements of the CO2 mixing ratio at a 300-m-tall tower, regional CO2 fluxes were estimated for several months, from the first obtained data. Estimates of a monthly-integrated surface CO2 flux over the region were obtained by the analysis of average gradients and estimates of the rate of vertical mixing between the atmospheric boundary layer (ABL) and the free troposphere. For the comparison of the ABL budget method and field measurements a zero-dimensional mathematical model of the ecosystem of Siberian boreal forests was used. The model is a system of ordinary differential equations with additional conditions superimposed on the parameters. The main occurring processes are described - photosynthesis, respiration, seasonal changes of active phytomass, water balance of trees, the influence of light, humidity, and temperature on photosynthesis and respiration. (C) 2011 Published by Elsevier B. V. Selection and/or peer-review under responsibility of School of Environment, Beijing Normal University.

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Доп.точки доступа:
Barkhatov, Y.V.; Belolipetsky, P.V.; Белолипецкий, Павел Викторович; Degermendzhi, A.G.; Belolipetskii, V.M.; Белолипецкий, Виктор Михайлович; Verkhovets, S.V.; Timokhina, A.V.; Panov, A.V.; Shchemel, A.L.; Vedrova, E.F.; Trephilova, O.V.; Yang, Z \ed.\

[Text] / I. V. Krasnov // Chin. Phys. B. - 2015. - Vol. 24, Is. 6. - Ст. 063701, DOI 10.1088/1674-1056/24/6/063701. - Cited References:22 . - ISSN 1674-1056. - ISSN 1741-4199РУБ Physics, Multidisciplinary

Аннотация: Conditions have been studied under which a polychromatic optical superlattice can form and trap the Coulomb cluster of two strongly interacting ions. In our previous work (Krasnov I V and Kamenshchikov L P 2014 Opt. Comm. 312 192) this new all-optical method of obtaining and confining the Coulomb clusters was demonstrated by numerical simulations for special values of the optical superlattice parameters and in the case of Yb ions. In the present paper the conditions are explicitly formulated, under which the long-lived two-ion cluster in the superlattice cell is formed. The peculiarity of these conditions is the renormalization of the ion-ion Coulomb interaction. Notably, the renormalized Coulomb force is determined by the effective charge which depends on the light field parameters and can strongly differ from the "bare" ion charge. This result can be accounted for by the combined manifestation of the quantum fluctuations of optical forces, nonlinear dependence of these forces on the velocity, and non-Maxwellian (Tsallis type) velocity distribution of the ions in the optical superlattice. Explicit analytical formulas are also obtained for the parameters of the optical two-ion cluster.

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Computat Modeling, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Krasnov, I.V.; Краснов, Игорь Васильевич

[Text] / I. V. Krasnov, L. P. Kamenshchikov // Laser Phys. - 2015. - Vol. 25, Is. 11. - Ст. 115501, DOI 10.1088/1054-660X/25/11/115501. - Cited References:26 . - ISSN 1054-660X. - ISSN 1555-6611РУБ Optics + Physics, Applied

Аннотация: On the basis of numerical simulations and analytical calculations it is proved that the dissipative optical superlattice induced by the rectified gradient force is able to create and trap cold ion Coulomb clusters. In contrast to our previous work (2014 Opt. Commun. 312 192), in the present paper, we do not use the approximation of slow ions (SI), but take into account the non-conservative nature of the trapping force in the optical superlattice as well as the velocity dependence of the friction coefficient of ions and multiplicative nature of the quantum fluctuations of optical forces. It is shown that these factors significantly affect both the formations conditions of the ion Coulomb clusters and their characteristics. It is also demonstrated that their consequences can be well-described by the renormalized SI model. In this model, the electric ion charge is replaced by the effective charge which depends on the light field parameters.

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Держатели документа:
Russian Acad Sci, Inst Computat Modelling, Siberian Div, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kamenshchikov, L.P.; Каменщиков, Леонид Петрович; Краснов, Игорь Васильевич

[Текст] : статья / Д. А. Архипов [и др.] // Научно-технический вестник информационных технологий, механики и оптики. - 2015. - Т. 15, № 6. - С. 1000-1007 . - ISSN 2226-1494
   Перевод заглавия: Performance optimization of the diode-pumped solid-state laser for space applications

УДК	535.015; 53.082.6

Аннотация: Предмет исследований. Теоретически и экспериментально исследованы теплофизические и оптические методы стабилизации характеристик твердотельного лазера с диодной накачкой для его применения в системах лазерной космической связи и лазерной дальнометрии. Методы. Исследования проведены с использованием оригинальной конструкции лазерного модуля твердотельного лазера с диодной накачкой, которая включает в себя Nd:YAG активный элемент лазера в виде слэба с оптической накачкой излучением линейки лазерных диодов типа QCW 400W производства фирмы NORTHROP GRUMMAN, неустойчивый двухпроходный резонатор с поворотом апертуры пучка на 180° и выводным зеркалом с переменным коэффициентом отражения, систему термостабилизации режимов генерации линеек лазерных диодов на основе гипертеплопроводящих пластин. Гипертеплопроводящие пластины позволяют исключить традиционные проточные системы охлаждения рабочих элементов твердотельных лазеров. Режим стабилизации температуры обеспечивается с помощью алгоритма широтно-импульсной модуляции мощности дополнительных электрических нагревателей. Для компенсации нестационарных тепловых искажений показателя преломления слэба в схему резонатора лазера включен призменный отражатель с углом при вершине 120°. На его узкие грани нанесено отражающее покрытие, а на широкую - просветляющее. В результате тройного отражения пучка внутри отражателя происходит поворот апертуры пучка на 180°. При осевой симметрии температурных искажений слэба такая процедура приводит к компенсации фазовых искажений выходного лазерного пучка. Для подавления паразитной генерации в слэбе используются диэлектрические оптические покрытия широких граней слэба. Основные результаты. Теоретически и экспериментально показано, что применение гипертеплопроводящих пластин совместно с алгоритмом широтно-импульсной модуляции позволяет обеспечить стабилизацию температуры подложек линеек лазерных диодов с точностью ± 0,1 °С и, одновременно выравнивать распределения температуры по ее поверхности с отклонением менее 1 °С. Оптическая схема резонатора лазера позволяет сохранить угловую расходимость излучения, превышающую дифракционный предел не более чем в два раза, при мощности накачки до 100 Вт. Показано, что для повышения эффективности световой накачки и коэффициента полезного действия лазера в целом необходимо использовать многослойные покрытия широких оптических поверхностей слэба на основе чередующихся слоев SiO2 и ZrO2. Практическая значимость. Предложена оригинальная конструкция лазерного модуля твердотельного лазера с диодной накачкой, позволяющая за счет температурной стабилизации линейки лазерных диодов и компенсации искажений оптического качества активного элемента оптимизировать режимы накачки и генерации излучения твердотельных лазеров. Разработанные методы оптимизации характеристик твердотельного лазера с диодной накачкой применимы и в космических условиях, что становится определяющим фактором при разработке лазеров космического базирования.
Subject of Research. Thermophysical and optical techniques of parameter regulation for diode pumped solid-state laser are studied as applied to space laser communication and laser ranging lines. Methods. The investigations are carried out on the base of the original design of diode pumped solid-state laser module that includes the following: Nd:YAG slab element, diode pumped by 400W QCW produced by NORTHROP GRUMMAN; two-pass unstable resonator with rotation of the laser beam aperture about its axis through 1800; the output mirror of the resonator with a variable reflection coefficient; hyperthermal conductive plates for thermal stabilization of the laser diode generation modes. The presence of thermal conductive plates excludes conventional running water systems applied as cooling systems for solid-state laser components. The diodes temperature stabilization is achieved by applying the algorithm of pulse-width modulation of power of auxiliary electric heaters. To compensate for non-stationary thermal distortions of the slab refractive index, the laser resonator scheme comprises a prism reflector with an apex angle of 1200. Narrow sides of the prism are covered with reflective coating, and its wide side is sprayed with antireflection coating. The beam aperture is turned around its axis through 1800 because of triple reflection of the beam inside the prism. The turning procedure leads to compensating for the output beam phase distortions in view of symmetric character of the aberrations of slab refractive index. To suppress parasitic oscillations inside the slab, dielectric coatings of wide sides of the slab are used. Main Results. We have demonstrated theoretically and experimentally that the usage of hyperthermal conductive plates together with the algorithm of pulse-width modulation provides stabilizing of the diode substrate temperature accurate within ± 0.1 °С and smoothing the temperature distribution along the plate surface accurate within 1 °С. Optical schematic diagram of the laser resonator keeps the laser beam divergence not exceeding a diffraction limit more than twice under a light pump power of 100 W. We have also shown that to increase the lasing efficiency, slab multilayer dielectric coatings made of SiO2 и ZrO2 should be used. Practical Relevance. We have proposed original design of the diode pumped solid-state laser module optimizing the generation and pump modes of solid-state lasers by the temperature stabilization technique for laser diode array and by compensation of the slab aberrations. The techniques are also applicable under space conditions; that is an important factor at developing the space-based lasers.

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Держатели документа:
«Научно-исследовательский институт оптико-электронного приборостроения» (ОАО «НИИ ОЭП»)
ФГБУН Институт вычислительного моделирования Сибирского отделения Российской академии наук

Доп.точки доступа:
Архипов, Д.А.; Arkhipov D.A.; Венглюк, В.И.; Venglyuk V.I.; Деревянко, В.А.; Derevyanko V.A.; Егоров, М.С.; Egorov M.S.; Резунков, Ю.А.; Rezunkov Yu.A.; Степанов, В.В.; Stepanov V.V.

/ H. Lammer [et al.] // Mon. Not. R. Astron. Soc. Lett. - 2016. - Vol. 461, Is. 1. - PL62-L66, DOI 10.1093/mnrasl/slw095 . - ISSN 1745-3925
Аннотация: For the hot exoplanets CoRoT-24b and CoRoT-24c, observations have provided transit radii RT of 3.7 ± 0.4R? and 4.9 ± 0.5R?, and masses of ?5.7M? and 28 ± 11M?, respectively. We study their upper atmosphere structure and escape applying an hydrodynamic model. Assuming RT ? RPL, where RPL is the planetary radius at the pressure of 100 mbar, we obtained for CoRoT-24b unrealistically high thermally driven hydrodynamic escape rates. This is due to the planet's high temperature and low gravity, independent of the stellar EUV flux. Such high escape rates could last only for <100 Myr, while RPL shrinks till the escape rate becomes less than or equal to the maximum possible EUV-driven escape rate. For CoRoT-24b, RPL must be therefore located at ?1.9-2.2R? and high altitude hazes/clouds possibly extinct the light at RT. Our analysis constraints also the planet's mass to be 5-5.7M?. For CoRoT-24c, RPL and RT lie too close together to be distinguished in the same way. Similar differences between RPL and RT may be present also for other hot, low-density sub-Neptunes. © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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Держатели документа:
Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, Graz, Austria
Institute of Computational Modelling SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Thuringer Landessternwarte Tautenburg, Sternwarte 5, Tautenburg, Germany
Institute for Astronomy, University of Vienna, Turkenschanzstrasse 17, Vienna, Austria

Доп.точки доступа:
Lammer, H.; Erkaev, N. V.; Fossati, L.; Juvan, I.; Odert, P.; Cubillos, P. E.; Guenther, E.; Kislyakova, K. G.; Johnstone, C. P.; Luftinger, T.; Gudel, M.