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Proceedings Paper

Coherent light backscattering by refractive turbulence in the atmosphere
Author(s): Yurij I. Kopilevich
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Paper Abstract

A sharp peak is shown theoretically to exist in angular distribution of light scattered by a layer of ran- dom medium with weak refractive index fluctuations in the vicinity of backward direction. The peak width may be estimated by the ratio of incident radiation wavelength and the turbulence correlation scale. The effect is found to be formed by coherent addition of contributions from elementary layers, and may be considered as an analogue to 'weak photon localisation' phenomena in random media. When the width of scattering layer is large enough compared with the correlation scale of refractive index inhomogeneities, the differential scattering cross-section is composed by the 'coherent' component and 'incoherent' one, obtained earlier by V. I. Tatarski. In the case of visible or IR radiation (in contrast to microwaves) the 'coherent' constituent determines the scattering for large angles close to 180 deg. Quantitative estimates show the backscattering by turbulent layers in atmosphere to produce noticeable contributions to signal registered in remote sensing monostatic lidar experiments, and thus the effect under consideration has to be taken into account when interpretation of laser remote sounding data is carried out.

Paper Details

Date Published: 21 December 1994
PDF: 6 pages
Proc. SPIE 2312, Optics in Atmospheric Propagation and Random Phenomena, (21 December 1994); doi: 10.1117/12.197368
Show Author Affiliations
Yurij I. Kopilevich, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 2312:
Optics in Atmospheric Propagation and Random Phenomena
Anton Kohnle; Adam D. Devir, Editor(s)

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