Stability of topological properties of optical vortices after diffraction on a phase screen

Kotlyar, V. V.; Kovalev, Alexey A.; Abramochkin, Eugeny; Козлова, Е. С.

doi:10.1016/j.optcom.2020.126471

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The simplest optical elements that generate vortex optical fields are a spiral phase plate and a spiral axicon [18][19][20][21][22][23]. A feature of a vortex beam formed by such optical elements is an isolated intensity zero at the optical axis that appears just behind a spiral phase element.…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenon of diffraction is one of manifestations of the wave nature of optical radiation [30]. Nevertheless, there exist optical structures capable of keeping their original intensity distribution of the optical field while propagating in a proper medium [1][2][3][4]22,23]. Invariance is the main property of optical modes when propagating in their medium.…”

Section: Introductionmentioning

confidence: 99%

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Propagation of a Partially Coherent Bessel—Gaussian Beam in a Uniform Medium and Turbulent Atmosphere

Lukin,

Lukin

2024

Preprint

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The study of coherent vortices remains an urgent field of singular optics of vortex beams. In this paper, coherent properties of partially coherent vortex Bessel—Gaussian optical beams propagating through a uniform medium (free space) or a turbulent atmosphere are examined theoretically. The consideration is based on analytical solution of the equation for the transverse second-order mutual coherence function of the field of a partially coherent optical radiation in a turbulent atmosphere. For the partially coherent Bessel—Gaussian beam, the second-order mutual coherence function of the source field is taken as a Gaussian Shell-model. In this approximation, we analyze the behavior of the coherence degree and the integral coherence scale of these beams as a function of the propagation pathlength, propagation conditions, and beam parameters, such as the radius of the Gauss factor of the beam, parameter of the Bessel factor of the beam, topological charge, and correlation width of the source field of partially coherent radiation. In addition, the integral coherence scale of the partially coherent vortex Bessel—Gaussian beam is compared with that of the partially coherent Gaussian beam. It is found that as a partially coherent vortex Bessel—Gaussian beam propagates through a turbulent atmosphere, there appear not two (as might be expected: one due to atmospheric turbulence and another due to partial coherence of the source field), but only one ring dislocation of the coherence degree (due to the simultaneous effect of both these factors on the optical radiation). In addition, it is shown that the dislocation of the coherence degree that affects significantly the beam coherence level is formed only for beams, for which the coherence width of the source field is larger than the diameter of the first Fresnel zone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propagation of a Partially Coherent Bessel—Gaussian Beam in a Uniform Medium and Turbulent Atmosphere

Lukin,

Lukin

2024

Preprint

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“…By exploring the self-reconstruction properties of a partially coherent LG beam blocked by an opaque obstacle, the work in [9] demonstrates that it is still possible to detect the TC from degree of coherence distribution in the focal plane. It is experimentally shown in [10] that optical vortex with three intensity petals formed by complex spiral phase plate can be determined after scattering by diffuser if the phase dispersion of the diffuser is less than 3π/2. An adaptive compensation is applied on phase and its effect on the detection of OAM states of LG beams under weak, moderate and strong turbulence conditions is investigated in [11].…”

Section: Introductionmentioning

confidence: 99%

Mutual coherence function based topological charge detection in a Gaussian vortex beam optical communication system

Eyyuboğlu¹

2022

Phys. Scr.

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We investigate a topological charge (TC) detection schema for an optical communication system employing Gaussian vortex beam (GVB). In this scenario, the transmitter maps the electrical message symbols to the TCs of GVBs. Thus obtained optical signal propagates in turbulent atmosphere arriving at the receiver, where a detection process is implemented to determine the TC of GVB by correlating the imaginary part of the mutual coherence function (MCF) of the incoming beam against the stored profiles. The feasibility of such a schema is firstly established by examining and comparing the analytical formulation of MCF and that of random phase screen setup. The latter is then used to explore the success rate and boundaries of this particular detection schema. Our results show that the proposed detection schema can operate with a error rate of 5 % at a link length of 5.5 km and atmospheric turbulence structure constant of 10-14.

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Modeling analysis of vortex beams propagation through a merged atmospheric turbulence and aerosol medium

Yang

et al. 2021

2021 19th International Conference on Optical Communications and Networks (ICOCN)

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Stability of topological properties of optical vortices after diffraction on a phase screen

Cited by 5 publications

References 24 publications

Propagation of a Partially Coherent Bessel—Gaussian Beam in a Uniform Medium and Turbulent Atmosphere

Propagation of a Partially Coherent Bessel—Gaussian Beam in a Uniform Medium and Turbulent Atmosphere

Mutual coherence function based topological charge detection in a Gaussian vortex beam optical communication system

Modeling analysis of vortex beams propagation through a merged atmospheric turbulence and aerosol medium

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