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Waves in weakly anisotropic 3D inhomogeneous media: quasi-isotropic approximation of geometrical optics

 a,  b,  c
a Space Research Institute, Russian Academy of Sciences, Profsoyuznaya str. 84/32, Moscow, 117997, Russian Federation
b Kamyshin Technological Institute, ul. Lenina 6a, Kamyshin, Volgograd Region, 403850, Russian Federation
c Geophysical Center, Russian Academy of Sciences, ul. Molodezhnaya 3, Moscow, 117296, Russian Federation

The quasi-isotropic approximation (QIA) of geometrical optics is outlined. The main idea of the method is that electromagnetic waves in weakly anisotropic media preserve their transverse structure as they do in isotropic media. Advantages of the QIA are illustrated by considering electromagnetic wave propagation in plasma, a number of optical problems (liquid crystals, hiral media, single mode optical fibres), acoustical problems of weakly anisotropic elastic media, and quantum mechanical polarisation effects of the Stern-Gerlach type. New modifications of the QIA are presented, namely the method of split rays and the synthetic approach, the latter being applicable even for strongly anisotropic media.

Fulltext pdf (783 KB)
Fulltext is also available at DOI: 10.1070/PU1996v039n02ABEH000131
PACS: 42.15.−i, 42.25.Bs, 42.68.Ay, 92.60.Ta (all)
DOI: 10.1070/PU1996v039n02ABEH000131
URL: https://ufn.ru/en/articles/1996/2/b/
A1996UB80800002
Citation: Kravtsov Yu A, Naida O N, Fuki A A "Waves in weakly anisotropic 3D inhomogeneous media: quasi-isotropic approximation of geometrical optics" Phys. Usp. 39 129–154 (1996)
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Оригинал: Кравцов Ю А, Найда О Н, Фуки А А «Волны в слабоанизотропных трехмернонеоднородных средах: квазиизотропное приближение геометрической оптики» УФН 166 141–167 (1996); DOI: 10.3367/UFNr.0166.199602b.0141

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