From Event: SPIE Optical Engineering + Applications, 2017
General anisotropy leads to different effects along the horizontal axis of a propagating beam than along the vertical axis.
To better understand these effects, we developed theoretical models for beam diameter, mean intensity, and scintillation
index of a Gaussian-beam wave. Two methods, valid in both weak and strong fluctuation regimes, are compared to
determine beam diameter. Scintillation-index contours exhibit an elliptical shape corresponding to anisotropy while
mean-intensity contours vary with path length and have no such obvious correspondence. The mean-intensity and
scintillation-index analyses are based on weak-irradiance-fluctuation theory.
Melissa Beason, Larry Andrews, and Ronald Phillips, "Study on the effect of anisotropy on a propagating beam," Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080B (Presented at SPIE Optical Engineering + Applications: August 08, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2274197.
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