Results 221 to 230 of about 1,035 (272)

Beam wander experiments: terrestrial path

open access: yesSPIE Proceedings, 2006
We report on a set of measurements made in December 2005 by researchers from the University of Central Florida, SPAWAR's Innovative Science and Technology Experiment Facility (ISTEF), Harris Corporation, NASA Kennedy Space Center, and Northrop Grumman.
R. L. Phillips   +13 more
openaire   +3 more sources

Beam wander of laser beam propagating through oceanic turbulence

Optik, 2016
Abstract The analytical expressions for beam wander of collimated and focused beam in oceanic turbulence are derived. Compared with the previously integrating ones, it can be seen that the two results are in agreement with each other exactly for the collimated and focused beam, respectively. Further, the influences of three main oceanic parameters (i.
Zhiqiang Wang   +2 more
exaly   +2 more sources

Beam wander effects on the scintillation index of a focused beam

open access: yesSPIE Proceedings, 2005
First-order weak-fluctuation Rytov theory predicts that the longitudinal (on-axis) scintillation component of an untracked focused beam projected along a horizontal path will become significantly smaller as the size of the transmitter aperture increases.
Larry C. Andrews   +3 more
openaire   +3 more sources

Modeling the PDF for the irradiance of an uplink beam in the presence of beam wander

open access: yesSPIE Proceedings, 2006
ABSTRACT Recent studies of ground-to-space beam propagation have revealed significant departures from Rytov theory when the beam diameter w 0 is on the order of the atmospheric coherence width r 0 . It has been shown that such departures from Rytov theory are primarily a consequence of beam wander and other low-order aberrations.
Parenti, Ronald   +3 more
openaire   +3 more sources

Beam wander of quantization beam in a non-Kolmogorov turbulent atmosphere

Optik, 2013
Abstract The effects of the non-Kolmogorov parameter α of turbulent spectrum on beam wandering of quantization Gaussian light propagating through turbulent aberration channel and turbulent tilt-aberration channel are studied based on the model of the effective photon annihilation/creation operator.
Congfang Si, Yixin Zhang
exaly   +2 more sources

Beam wander of partially coherent twisted elliptical vortex beam in turbulence

Optik, 2020
Abstract Based on the generalized Huygens–Fresnel theorem, the characteristics of beam wander in partially coherent elliptical vortex beams in anisotropic non-Kolmogorov turbulence are studied. Considering not only the vortex phase but also the twisted phase modulation in the partially coherent beams, the study of twisted phase modulation is carried ...
Lin Wang   +4 more
exaly   +2 more sources

Beam wander of electromagnetic partially coherent flat-topped beam propagating in turbulent atmosphere

open access: yesOptik, 2014
Beam wander of an electromagnetic partially coherent flat-topped (EPCFT) beam propagating through turbulent atmosphere is studied. The analytical expression of beam wander effect is obtained.
Guohua Wu, Anhong Dang, Hong Guo
exaly   +2 more sources

Beam wander of random electromagnetic Gaussian-shell model vortex beams propagating through a Kolmogorov turbulence

open access: yesOptics Communications, 2015
Beam wander of random electromagnetic Gaussian-Shell model (EGSM) vortex beams propagating through atmospheric turbulence is investigated. We develop the expression for beam wander of random EGSM vortex beams in theory. The effects of topological charge,
Guohua Wu, Wen Dai
exaly   +2 more sources

Capacities for Long-Distance Free-Space Optical Links Under Beam Wander Effects

open access: yesIEEE Photonics Technology Letters, 2010
The performance of the long-distance horizontal free-space optical (FSO) communication link under beam wander effects is studied from the perspective of information theory.
Yongxiong Ren, Anhong Dang, Hong Guo
exaly   +2 more sources

Beam wander of an Airy beam with a spiral phase

Journal of the Optical Society of America A, 2014
Beam wander of an Airy beam with a spiral phase in turbulence is investigated. Using the Wigner distribution function, analytical expressions for the second-order moments and second central moments of an Airy beam with a spiral phase in turbulence are derived.
Wei, Wen, Xiuxiang, Chu
openaire   +2 more sources

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