12th Central Scientific Research Institute

Sergiyev Posad, Russia

12th Central Scientific Research Institute

Sergiyev Posad, Russia
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Apeksimova D.V.,Zuev Institute of Atmospheric Optics | Geints Y.E.,Zuev Institute of Atmospheric Optics | Zemlyanov A.A.,Zuev Institute of Atmospheric Optics | Kabanov A.M.,Zuev Institute of Atmospheric Optics | And 4 more authors.
Atmospheric and Oceanic Optics | Year: 2010

Experimental results of the study of the evolution of the spatial profile and frequency spectrum of terawatt ultrashort Ti: Sa laser pulses propagating along atmospheric paths in the self-focusing mode are presented. The dependence of the laser radiation energy characteristics at the receiving plane on its initial peak power is determined. The tendency of an increase of the laser beam’s angular size and spectral width when increasing its output power is stated. The obtained regularities have been interpreted qualitatively and quantitatively based on the numerical calculations performed in the framework of the model of the nonstationary self-action of an ultrashort light pulse in air. The ob tained results are compared to the results of the authors’ earlier laboratory experiments on the filamentation of focused laser femtosecond radiation. © 2010, Pleiades Publishing, Ltd.

Shcherbin M.D.,12th Central Scientific Research Institute | Pavlyukov K.V.,12th Central Scientific Research Institute | Salo A.A.,12th Central Scientific Research Institute | Pertsev S.F.,12th Central Scientific Research Institute | Rikunov A.V.,12th Central Scientific Research Institute
Journal of Applied Mechanics and Technical Physics | Year: 2013

An attempt is undertaken to describe the development of the disturbed region of the atmosphere caused by the nuclear explosion over Hiroshima on August 6, 1945. Numerical simulation of the phenomenon is performed using the dynamic equations for a nonconducting inviscid gas taking into account the combustion of urban buildings, phase changes of water, electrification of ice particles, and removal of soot particles. The results of the numerical calculation of the development of the disturbed region indicate heavy rainfall, the formation of a storm cloud with lightning discharges, removal of soot particles, and the formation of vertical vortices. The temporal sequence of these meteorological phenomena is consistent with the data of observations. Because of the assumptions and approximations used in solving the problem, the results are of qualitative nature. Refinement of the results can be obtained by a more detailed study of the approximate initial and boundary conditions of the problem. © 2013 Pleiades Publishing, Ltd.

Smirnov E.V.,Moscow State Industrial University | Stupitskii E.L.,12th Central Scientific Research Institute
Journal of Surface Investigation | Year: 2010

Based on the molecular dynamics method a numerical algorithm to calculate the effect of highenergy particles from the rarefied plasma flow on the surface of crystalline and amorphous solids is developed. Sizes and properties of generated defects are determined. It is shown that they can appreciably affect the optical properties of transparent bodies such as glass. © 2010 Pleiades Publishing, Ltd.

Rudenko V.V.,12th Central Scientific Research Institute
Plasma Physics Reports | Year: 2010

The problem of laser deposition with allowance for thermal radiation transport inside and outside the laser torch is considered in a multigroup approximation. The energy fluxes of laser torch thermal radiation onto a target in the far and near zones are calculated as functions of time and the character of the exposure. It is shown that absorption of thermal fluxes in the substrate and target in the course of laser deposition results in their substantial heating. The possibility of diagnosing thermal radiation fluxes from the laser torch by using photodetectors is demonstrated. © 2010 Pleiades Publishing, Ltd.

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