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Optical Engineering

Analysis of beam wander effects for a horizontal-path propagating Gaussian-beam wave: focused beam case
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Paper Abstract

Failure of the first-order Rytov approximation to properly predict the scintillation index of a large-aperture focused beam, or an uplink collimated (or focused) beam, has been discussed in several recent publications, which cite beam wander effects as the main reason for this failure. We use computer simulations to examine several aspects of beam wander phenomena on a propagating convergent beam in the weak-fluctuation regime over a horizontal path at high altitude for which the refractive index structure parameter is on the order of C n2 =1.39×10-16 m-2/3. Simulation results are presented at various ranges up to 10 km for (1) the beam wander centroid displacement, (2) the kurtosis excess of the irradiance profile, (3) the irradiance profile, (4) the mean-square hot spot displacement from the boresight and from the centroid, and (5) the scintillation index at the optical axis of the beam. In addition, simulation results are compared with theoretical models.

Paper Details

Date Published: 1 August 2007
PDF: 11 pages
Opt. Eng. 46(8) 086002 doi: 10.1117/1.2772263
Published in: Optical Engineering Volume 46, Issue 8
Show Author Affiliations
Jaume Recolons, Univ. Politècnica de Catalunya (Spain)
Larry C. Andrews, Univ. of Central Florida (United States)
Ronald L. Phillips, Univ. of Central Florida (United States)

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