Abstract
We undertake the aperture averaged scintillation derivation of Gaussian vortex beam using Rytov approximation. For this purpose, point-like scintillation is formulated initially and is then converted into the aperture averaging form via overlap procedure. The numeric values delivered by this aperture averaged derivation are plotted side by side against the results obtained from random phase screen simulation. There it is seen that similar to point-like scintillation, the range of validity of the aperture averaged scintillation of Rytov approximation is also limited to weak turbulence range. Incorporating the effective spectrum of spherical wave into the aperture averaged expression demonstrates that it is possible to extend the validity of the aperture averaged derivation based on Rytov approximation to moderate and strong turbulence regimes. Our tests show that additional source beam specific terms are needed to fully adapt the effective spectrum.
Published Version
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