Authors

J. Recolons; L. C. Andrews;R. L. Phillips

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

atmospheric optics; turbulence; beams; LASER-BEAM; TURBULENT ATMOSPHERE; WEAK SCINTILLATION; RYTOV-METHOD; SPACE PATHS; APPLICABILITY; SIMULATION; Optics

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-n(2)= 1.39 x 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 meansquare 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.

Journal Title

Optical Engineering

Volume

46

Issue/Number

8

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

11

WOS Identifier

WOS:000250200800027

ISSN

0091-3286

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