Results 11 to 20 of about 1,035 (272)
PhotonicsWe derive the analytical expressions for root-mean-square (rms) beam wander (BW) and relative BW of a twisted electromagnetic elliptical vortex (TEEV) beam propagating through non-Kolmogorov atmospheric turbulence with the help of the extended Huygens ...
Kai Huang +3 more
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Effects of Anisotropic Turbulent Ocean on Propagation of Asymmetric Bessel-Gaussian Beam
IEEE Photonics JournalAiming at the propagation of asymmetric vortex beam, we investigate the spreading and wander characteristics of asymmetric Bessel-Gaussian beam in oceanic turbulence. Based on the cross-spectral density and Wigner distribution function of beam field, the
Lin Yu +3 more
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Modelling the Memory of Turbulence-Induced Beam Wander
, 2019 One of the major challenges for long range, high speed Free-Space Optical (FSO) communication is turbulence induced beam wander. Beam wander causes fluctuations in the received intensity as well as crosstalk in mode division multiplexed systems. Existing models for beam wander make use of probability distributions and long term averages and are not ...
Cox, Mitchell A. +3 more
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Beam wander relieved orbital angular momentum communication in turbulent atmosphere using Bessel beams. [PDF]
Sci Rep, 2017 Optical beam wander is one of the most important issues for free-space optical (FSO) communication. We theoretically derive a beam wander model for Bessel beams propagating in turbulent atmosphere.
Yuan Y +6 more
europepmc +2 more sources
Incoherent beam combination of higher-order Gaussian beam in atmospheric turbulence
Results in OpticsIn this article, an incoherent beam combination of higher-order Gaussian beams through atmospheric turbulence is studied. An analytical expression of the combined intensity and spot size of higher-order Gaussian beams such as Hermite Gaussian (HG ...
Mukesh Kumar +3 more
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天地一体化信息网络, 2021 The eff ect of beam center shift on the performance of satellite chaos laser safety communication system in spaceintegrated-ground information network was studied, the bit error rate (BER) formulae with external and internal mismatch caused by beam ...
Mi LI +5 more
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A Survey of Structure of Atmospheric Turbulence in Atmosphere and Related Turbulent Effects
Atmosphere, 2021 The Earth’s atmosphere is the living environment in which we live and cannot escape. Atmospheric turbulence is a typical random inhomogeneous medium, which causes random fluctuations of both the amplitude and phase of optical wave propagating through it.
Fazhi Wang +4 more
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Turbulence-induced persistence in laser beam wandering [PDF]
Optics Letters, 2015 We have experimentally confirmed the presence of long-memory correlations in the wandering of a thin Gaussian laser beam over a screen after propagating through a turbulent medium. A laboratory-controlled experiment was conducted in which coordinate fluctuations of the laser beam were recorded at a sufficiently high sampling rate for a wide range of ...
Zunino, Luciano José +3 more
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IEEE Photonics Journal, 2018 The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG
Mingjian Cheng +5 more
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Are FRB Wandering Narrow Beams? [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 It is generally assumed that the sources of Fast Radio Bursts radiate roughly isotropically, so that the observed low duty cycle of any individual source indicates a similar low duty cycle of its radio-frequency emission. An alternative hypothesis is that the radiative duty cycle is ${\cal O}(1)$, but that the radiation is emitted in a beam with a ...
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