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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 5 — May. 1, 2012
  • pp: 832–841

Analytical expressions for the log-amplitude correlation function of a plane wave through anisotropic atmospheric refractive turbulence

V. S. Rao Gudimetla, Richard B. Holmes, Carey Smith, and Gregory Needham  »View Author Affiliations


JOSA A, Vol. 29, Issue 5, pp. 832-841 (2012)
http://dx.doi.org/10.1364/JOSAA.29.000832


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Abstract

The effect of anisotropic Kolmogorov turbulence on the log-amplitude correlation function for plane-wave fields is investigated using analysis, numerical integration, and simulation. A new analytical expression for the log-amplitude correlation function is derived for anisotropic Kolmogorov turbulence. The analytic results, based on the Rytov approximation, agree well with a more general wave-optics simulation based on the Fresnel approximation as well as with numerical evaluations, for low and moderate strengths of turbulence. The new expression reduces correctly to previously published analytic expressions for isotropic turbulence. The final results indicate that, as asymmetry becomes greater, the Rytov variance deviates from that given by the standard formula. This deviation becomes greater with stronger turbulence, up to moderate turbulence strengths. The anisotropic effects on the log-amplitude correlation function are dominant when the separation of the points is within the Fresnel length. In the direction of stronger turbulence, there is an enhanced dip in the correlation function at a separation close to the Fresnel length. The dip is diminished in the weak-turbulence axis, suggesting that energy redistribution via focusing and defocusing is dominated by the strong-turbulence axis. The new analytical expression is useful when anisotropy is observed in relevant experiments.

© 2012 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.7060) Atmospheric and oceanic optics : Turbulence

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: September 1, 2011
Revised Manuscript: January 13, 2012
Manuscript Accepted: January 16, 2012
Published: May 1, 2012

Citation
V. S. Rao Gudimetla, Richard B. Holmes, Carey Smith, and Gregory Needham, "Analytical expressions for the log-amplitude correlation function of a plane wave through anisotropic atmospheric refractive turbulence," J. Opt. Soc. Am. A 29, 832-841 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-5-832


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