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Lukin I.P.,Zuev Institute of Atmospheric Optics
Applied Optics | Year: 2014

Transformation of vortex Bessel beams during propagation in turbulent atmosphere is theoretically analyzed. Deforming influence of the random inhomogeneity of the turbulent medium on propagation of diffraction-free beams leads to disappearance of their invariant properties. In the given research, features of evolution of the spatial structure of distribution of mean intensity of vortex Bessel beams in turbulent atmosphere are analyzed. A quantitative criterion of possibility of carrying over of a dark central domain by vortex Bessel beams in a turbulent atmosphere is derived. The analysis of the behavior of several physical parameters of mean-level optical radiation shows that the shape stability of a vortex Bessel beam increases with the topological charge of this beam during its propagation in a turbulent atmosphere. © 2014 Optical Society of America. Source

Lukin V.P.,Zuev Institute of Atmospheric Optics
Physics-Uspekhi | Year: 2014

In connection with the wide use of optoelectronic systems, we review the development of adaptive optics as an effective tool that allows using controllable optical elements to eliminate irregular distortions that occur as light propagates in an inhomogeneous medium. The subject matter of this rapidly developing field of science and technology is described. Of the ideas under development in recent years, many have been around for quite a long time, but it is only now, with the development of an up-to-date optoelectronic element base, that they have started being widely incorporated into science and engineering practice. We discuss the development of adaptive optics from mere ideas to their application in astronomy, high- power laser physics, and medicine. The current state of adaptive optics in stellar and solar astronomy is reviewed, and some results of its use in distortion correction systems of high-power laser systems and facilities are presented. © 2014 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences. Source

Kochanov V.P.,Zuev Institute of Atmospheric Optics
Journal of Experimental and Theoretical Physics | Year: 2014

Based on a quantum-mechanical expression for the kernel of the collision integral and the dispersion intermolecular interaction potential, we have calculated the line profiles in which the collisions with scattering through large and classical small angles as well as the diffraction scattering of molecules have been simultaneously taken into account. By comparing the calculated profiles with those in the models of hard velocity-changing collisions, we show that disregarding soft collisions leads to a noticeably sharper line shape. In an effort to quantitatively process the spectra, we have parameterized the calculated profiles and obtained their algebraic approximation. © Pleiades Publishing, Inc., 2014. Source

Nikitin A.V.,Zuev Institute of Atmospheric Optics
Computer Physics Communications | Year: 2012

A new code designed to calculate the 6C, 9C, and 12C symbols for C3 v, Td, and Oh point groups is presented. The program is based on an algorithm that uses the symmetry property between pair and impair representations. This algorithm allows one to speed up the C-symbols calculation and increase the efficiency of spectroscopic programs based on the irreducible tensorial formalism. © 2011 Elsevier B.V. Source

Kochanov V.P.,Zuev Institute of Atmospheric Optics
Journal of Quantitative Spectroscopy and Radiative Transfer | Year: 2011

Analytical approximate expressions for speed-dependent Rautian-Sobel'man, Voigt, and general line profiles, including spectral line mixing, were obtained. Systematic errors of the approximate profiles are within 0.7% for the mass ratios of perturbing and absorbing molecules mb/ma≤9. The calculation time of the approximate line profiles is much shorter than the time required for calculating exact expressions for the line profiles. An approximate analytical expression for the observable homogeneous line width was derived. A least-square fitting of the singlet methane absorption line centered at 6107.17cm-1 was performed, using the approximate line profiles obtained. © 2011 Elsevier Ltd. Source

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