Spatial correlation properties of apertured partially coherent beams propagating through atmospheric turbulence |
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Authors: | X Ji G Ji |
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Institution: | (1) Department of Physics, Sichuan Normal University, Chengdu, 610068, P.R. China;(2) College of Information Management, Chengdu University of Technology, Chengdu, 610059, P.R. China |
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Abstract: | The spatial correlation properties of apertured partially coherent beams propagating through atmospheric turbulence are studied
in detail. By using the quadratic approximation of the Rytov’s phase structure function and the finite complex Gaussian expansion
of the aperture function, the closed-form expression for the spectral degree of coherence of apertured partially coherent
beams in turbulence is derived. It is shown that the larger the aperture width h is, and the smaller the spatial correlation
length σ0 of the source is, the less the spatial correlation is affected by turbulence. Specially, the influence of turbulence on the
spatial correlation for unapertured partially coherent beams is less than that for apertured ones. The spectral degree of
coherence is shown to possess phase singularities for apertured partially coherent beams, but the phase singularities behavior
disappears when the turbulence is strong enough, which is very different from the behavior of unapertured partially coherent
beams. In addition, a comparison between the width of the spectral degree of coherence and that of the spectral intensity
of apertured partially coherent beams in turbulence is also given, and some interesting results are obtained. The results
are interpreted physically.
PACS 42.68.Bz; 42.79.Ag; 42.25.Fx |
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Keywords: | |
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