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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:
Journal Article: 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.
Efimov, Anatoly. Effects of residual coherence on the scintillation of a partially coherent beam. United States. doi:10.1364/OE.27.026874.
Efimov, Anatoly. Wed . "Effects of residual coherence on the scintillation of a partially coherent beam". United States. doi:10.1364/OE.27.026874.
@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},
issn = {1094-4087},
number = 19,
volume = 27,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/OE.27.026874

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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Works referenced in this record:

Spatial coherence at the output of multimode optical fibers
journal, January 2014


Analysis and simulation of a fiber bundle method for creating a partially spatially coherent beam
journal, January 2013


Linear algebraic theory of partial coherence: discrete fields and measures of partial coherence
journal, January 2002

  • Ozaktas, Haldun M.; Yüksel, Serdar; Kutay, M. Alper
  • Journal of the Optical Society of America A, Vol. 19, Issue 8
  • DOI: 10.1364/JOSAA.19.001563

Lateral-shearing, delay-dithering Mach–Zehnder interferometer for spatial coherence measurement
journal, January 2013


Simultaneous scintillation measurements of coherent and partially coherent beams in an open atmosphere experiment
conference, March 2014

  • Efimov, Anatoly; Velizhanin, Kirill; Gelikonov, Grigory
  • SPIE LASE, SPIE Proceedings
  • DOI: 10.1117/12.2037416

How modal noise in multimode fibers depends on source spectrum and fiber dispersion
journal, January 1985

  • Dandliker, R.; Bertholds, A.; Maystre, F.
  • Journal of Lightwave Technology, Vol. 3, Issue 1
  • DOI: 10.1109/JLT.1985.1074136

Effective number of degrees of freedom of partially coherent sources
journal, January 1982


Effective degree of coherence: a second look
journal, January 2015

  • Blomstedt, Kasimir; Setälä, Tero; Friberg, Ari T.
  • Journal of the Optical Society of America A, Vol. 32, Issue 5
  • DOI: 10.1364/JOSAA.32.000718

Intuitive model for the scintillations of a partially coherent beam
journal, January 2014


Variance of intensity for a discrete-spectrum, polychromatic speckle field after propagation through the turbulent atmosphere
journal, January 1981

  • Holmes, J. Fred; Rao Gudimetla, V. S.
  • Journal of the Optical Society of America, Vol. 71, Issue 10
  • DOI: 10.1364/JOSA.71.001176

Coherence and speckle contrast at the output of a stationary multimode optical fiber
journal, January 2018


Interrelation between the coherence properties and the space-time structure of light beams
journal, October 1980

  • Pasmanik, G. A.; Sidorovich, V. G.
  • Radiophysics and Quantum Electronics, Vol. 23, Issue 10
  • DOI: 10.1007/BF01033451

Covariance of the received intensity of a partially coherent laser speckle pattern in the turbulent atmosphere
journal, January 1992

  • Rao Gudimetla, V. S.; Holmes, J. Fred; Fossey, M. E.
  • Applied Optics, Vol. 31, Issue 9
  • DOI: 10.1364/AO.31.001286

The scintillations for weak atmospheric turbulence using a partially coherent source
journal, July 1983


Scintillation reduction using multiple transmitters
conference, April 1997

  • Kim, Isaac I.; Hakakha, Harel; Adhikari, Prasanna
  • Photonics West '97, SPIE Proceedings
  • DOI: 10.1117/12.273685

Speckle propagation through turbulence: Experimental*
journal, January 1978

  • Pincus, Philip A.; Fossey, Michael E.; Holmes, J. F.
  • Journal of the Optical Society of America, Vol. 68, Issue 6
  • DOI: 10.1364/JOSA.68.000760

Diode Laser Spatial Diversity Transmitter
conference, July 1989

  • Bruno, W. M.; Mangual, R.; Zarnpolin, R. F.
  • OE/LASE '89, SPIE Proceedings
  • DOI: 10.1117/12.951292

Partially coherent light generated by using single and multimode optical fibers in a high‐power Nd:glass laser system
journal, August 1993

  • Nakano, H.; Miyanaga, N.; Yagi, K.
  • Applied Physics Letters, Vol. 63, Issue 5
  • DOI: 10.1063/1.109955

Partially coherent beam propagation in atmospheric turbulence [Invited]
journal, January 2014


Coherence reduction using optical fibers
conference, August 2005

  • Wang, Qingsong; Giles, Michael K.
  • Optics & Photonics 2005, SPIE Proceedings
  • DOI: 10.1117/12.620375

Space-time duality and average number of terms in mode decomposition of pulse fields
journal, July 1997

  • Karelin, N. V.; Lazaruk, A. M.
  • Radiophysics and Quantum Electronics, Vol. 40, Issue 7
  • DOI: 10.1007/BF02675838

Different measures of speckle and coherence at the output of a multimode optical fiber
journal, December 2018


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.