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Title: Effects of residual coherence on the scintillation of a partially coherent beam

Abstract

Recent results show that partially coherent beams (PCB) can be conveniently generated in a multimode fiber and modulated with data at gigabit per second rates, which makes them attractive for free-space optical communication through turbulent atmosphere. An important feature of these realistic beams in contrast to model ones is the presence of residual coherence between pairs of points spatially separated by more than a few coherence radii on the beam aperture. In the present work we experimentally study the influence of this residual coherence on the scintillation of a partially coherent beam in a laboratory turbulence. It is shown that the total scintillation can be considered as a combination of scintillations of the coherent and incoherent parts of the full beam. When residual coherence is large the scintillation is mostly due to speckle motion on the detector. In the opposite case, the scintillation index settles at a low value pertaining to "ideal" homogeneous PCB.

Authors:
ORCiD logo
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1561345
Alternate Identifier(s):
OSTI ID: 1570616
Report Number(s):
LA-UR-18-28273
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:  
Directed Research and Development; 89233218CNA000001
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 19; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Efimov, Anatoly. Effects of residual coherence on the scintillation of a partially coherent beam. United States: N. p., 2019. Web. doi:10.1364/OE.27.026874.
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Efimov, Anatoly. Effects of residual coherence on the scintillation of a partially coherent beam. United States. https://doi.org/10.1364/OE.27.026874
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Efimov, Anatoly. Wed . "Effects of residual coherence on the scintillation of a partially coherent beam". United States. https://doi.org/10.1364/OE.27.026874.
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@article{osti_1561345,
title = {Effects of residual coherence on the scintillation of a partially coherent beam},
author = {Efimov, Anatoly},
abstractNote = {Recent results show that partially coherent beams (PCB) can be conveniently generated in a multimode fiber and modulated with data at gigabit per second rates, which makes them attractive for free-space optical communication through turbulent atmosphere. An important feature of these realistic beams in contrast to model ones is the presence of residual coherence between pairs of points spatially separated by more than a few coherence radii on the beam aperture. In the present work we experimentally study the influence of this residual coherence on the scintillation of a partially coherent beam in a laboratory turbulence. It is shown that the total scintillation can be considered as a combination of scintillations of the coherent and incoherent parts of the full beam. When residual coherence is large the scintillation is mostly due to speckle motion on the detector. In the opposite case, the scintillation index settles at a low value pertaining to "ideal" homogeneous PCB.},
doi = {10.1364/OE.27.026874},
journal = {Optics Express},
number = 19,
volume = 27,
place = {United States},
year = {Wed Sep 11 00:00:00 EDT 2019},
month = {Wed Sep 11 00:00:00 EDT 2019}
}
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https://doi.org/10.1364/OE.27.026874
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Figures / Tables:

Fig. 1 Fig. 1: Interferometrically measured average modulus of the complex degree of coherence as a function of image shear ∆r (spatial displacement between two images produced by the interferometer) of the output face of the fiber. Three color curves correspond to three different source bandwidths. Black dashed curve is the often used model 2 |more » $J$1 ($k$0$N$$A$$∆$$r$) /($k$0$N$$A$$∆$$r$)|, where $J$1 is the Bessel function of the first kind. Speckle pattern images of the fiber endface are shown on the right for each of the three curves in the main plot with speckle contrast values indicated.« less
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