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Analysis of beam wander effects for a horizontal-path propagating Gaussian-beam wave: focused beam case
Recolons Martos, Jaume; Andrews, L.C.; Phillips, R.L.
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
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=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.
Peer Reviewed
2012-05-11
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Radiocomunicació i exploració electromagnètica::Teledetecció
Laser beams
Fluctuations (Physics)
fluctuations
Laser beams
Light propagation
Optical focusing
Refractive index
Beam wander effects
Horizontal-path propagating Gaussian-beam wave
Focused beam case
Scintillation index
large-aperture focused beam
Uplink collimated beam
First-order Rytov approximation failure
Computer simulations
Weak fluctuation regime
Beam irradiance profile
Hot spot displacement
Beam wander centroid displacement
Làsers
Fluctuacions (Física)
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SPIE-INT SOCIETY OPTICAL ENGINEERING
         

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