Results 181 to 190 of about 21,556 (239)

Beam wander of partially coherent Airy beams

Journal of Modern Optics, 2014
The beam wander of a partially coherent Airy beam in a turbulent atmosphere was investigated. By using the extended Huygens–Fresnel integral, as analytical expression is derived for the second-order moment of a partially coherent Airy beam. Based on the theory proposed by Andrews, a general expression is obtained for the beam wander of a partially ...
Wei Wen, Xiuxiang Chu
openaire   +1 more source

Beam wander experiments: terrestrial path

SPIE 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
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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

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.
Lu Lu   +6 more
openaire   +1 more source

Beam wander characteristics of cos and cosh-Gaussian beams

Applied Physics B, 2009
Within the context of a general beam formulation, beam wander characteristics of cos and cosh-Gaussian beams are derived and numerically evaluated. In our graphs, the fundamental Gaussian beam is used as a benchmark for comparisons. The associated plots reveal that at small source sizes, a cos-Gaussian beam has the lowest beam wander, while this ...
C. Z. Çil   +3 more
openaire   +1 more source

Beam Wander and the Scintillation Index

Optical Sensors and Sensing Congress, 2020
Beam wander associated with a propagating beam in the atmosphere has impact on the short-term and long-term spot size, and the scintillation index. New theoretical models are presented here for beam wander and beam-wander-induced scintillation index. These models are then compared with computer simulation results.
openaire   +1 more source

Beam wandering of thin parallel beams through atmospheric turbulence

Waves in Random Media, 1991
Abstract Wandering and correlation of wandering of two parallel laser beams after crossing atmospheric turbulence are theoretically and experimentally investigated. A general expression is given, valid for propagation through a thick layer of turbulence, which includes as a particular case that of a path completely filled with turbulence. Two different
CONSORTINI, ANNA, Kevin A. O'Donnell
openaire   +3 more sources

Measurement and modeling of beam wander

SPIE Proceedings, 2011
We investigate the effects of beam wander on an uncorrected laser system. The goal is to enable an accurate assessment of irradiance at a receiver or target for a shipboard laser system, and in this paper we show that a maritime surface layer turbulence model is important for an accurate vertical profile.
Steve Hammel   +2 more
openaire   +1 more source

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