Speckle characteristics of vortex beams scattered from rough targets in turbulent atmosphere

Li, Yaqing; Wang, Liguo; Gong, Lei; Wang, Qian

doi:10.1016/j.jqsrt.2020.107342

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…This reduction is according to the conditions of coherence [1]. This behavior has also been explored with the reduction of the degree of coherence and the speckle contrast in [2], and in atmospheric turbid media [3,4]. This decreasing behavior agrees with the expected result from the van Cittert-Zernike theorem, where the effective transverse coherence length is inversely proportional to the field size entering the diffusing screen [5].…”

Section: Speckle Average Sizesupporting

confidence: 66%

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

Muñoz,

Rueda,

Restrepo

2022

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Section: Speckle Average Sizesupporting

confidence: 66%

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

Muñoz,

Rueda,

Restrepo

2022

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“…However, in case of strong turbulence, the scintillation indices increase. Moreover, the scintillation indices of Gaussian beam are higher than those of LG vortex beams [65]. Finally, Figure 4d shows the scintillation indices of single (beam 1 and beam 2) and double vortex beam (beam 3 and beam 4).…”

Section: Scintillation Propertiesmentioning

confidence: 91%

The Propagation of Vortex Beams in Random Mediums

Dalgaç¹,

Elmabruk²

2022

Vortex Dynamics - From Physical to Mathematical Aspects

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Vortex beams acquire increasing attention due to their unique properties. These beams have an annular spatial profile with a dark spot at the center, the so-called phase singularity. This singularity defines the helical phase structure which is related to the topological charge value. Topological charge value allows vortex beams to carry orbital angular momentum. The existence of orbital angular momentum offers a large capacity and high dimensional information processing which make vortex beams very attractive for free-space optical communications. Besides that, these beams are well capable of reducing turbulence-induced scintillation which leads to better system performance. This chapter introduces the research conducted up to date either theoretically or experimentally regarding vortex beam irradiance, scintillation, and other properties while propagating in turbulent mediums.

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“…In the past years, the propagations of the light beams affected by a turbulent medium have been extensively studied due to their interesting applications (Andrews and Phillips 1998;Baykal 2005). These studies have been included several types of laser beams through various turbulence media such as Laguerre-Gaussian, flat-topped Gaussian, Hollow-Gaussian, Bessel-Laguerre-Gaussian and multi-Gaussian beams (Zhong et al 2011; addition, many studies of this domain are recently published (Hricha et al 2020;Li et al 2020;Khandelwal 2020;Yang and Gao 2020). On the same context, it found that the biological tissue having a turbulent medium properties similar to the atmosphere and the ocean (Gökçe and Baykal 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

Ebrahim

Belafhal

2021

Opt Quant Electron

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In this paper, the effects of turbulent biological tissues (TBT) on the propagation properties of the coherent Laguerre-Gaussian (CLG) beams are studied. Based on the turbulence theory and using the power spectrum refractive-index model, the expression formulae of the average irradiance intensity and spreading properties of a CLG beam propagating in TBT are derived. The influence of propagation distance, beam orders, wavelengths and tissue turbulence parameters are then investigated numerically. It found that, the central dark zone of the circular/elliptical LG beams rises more rapidly as the propagation distance and the structural constant of the refractive index of the biological tissue increase and the beams become eventually more like Gaussian beams in the far-field under the influence of the turbulence biological tissues. Also, the numerical results proved that the effective beam spot radius increases as turbulence, wavelength, and propagation distance are increasing.Ultimately, the beams become circular under the influence of the turbulence of the biological tissue.As found that the effective beam spot radius along the x-axis becomes equal to that of the y-axis in high TBT which explain why an elliptical LG beam is converted into a circular one in higher structural constant of the turbulent tissue. Moreover, our results show that, the influence of the beam order m slightly greater than that of l on the beam spreading.

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Speckle characteristics of vortex beams scattered from rough targets in turbulent atmosphere

Cited by 12 publications

References 15 publications

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

The Propagation of Vortex Beams in Random Mediums

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

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