Annular beam scintillations in non-Kolmogorov weak turbulence |
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Authors: | H Ger?ekcio?lu and Y Baykal |
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Institution: | (1) Communications and Electronic Department, Prime Ministry Undersecretariat for Maritime Affairs, Gazi Mustafa Kemal Blv. No. 128, 06100 Maltepe, Ankara, Turkey;(2) Department of Electronic and Communication Engineering, ?ankaya University, ?ğretmenler Cad. No. 14, Y?z?nc?yıl, 06530 Balgat, Ankara, Turkey |
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Abstract: | In a weakly turbulent atmosphere governed by the non-Kolmogorov spectrum, the on-axis scintillation index is formulated and
evaluated when the incidence is an annular Gaussian type. When the power law of the non-Kolmogorov spectrum is varied, the
scintillation index first increases, and reaches a peak value, then starts to decrease, and eventually approaches zero. The
general trend is that when turbulence has a non-Kolmogorov spectrum with power law larger than the Kolmogorov power law, the
scintillation index values become smaller. For all power laws, collimated annular Gaussian beams exhibit smaller scintillations
when compared to pure Gaussian beams of the same size. Intensity fluctuations at a fixed propagation distance diminish for
the non-Kolmogorov spectrum with a very large power law, irrespective of the focal length and the thickness of optical annular
Gaussian sources. |
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Keywords: | |
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