Propagation dynamics of vector vortex beams in a strongly nonlocal nonlinear medium with parity-time-symmetric potentials

Yao, Gang; Chew, Khian−Hooi; Wu, Yan; Li, Yuhua; Chen, Rui-Pin

doi:10.1088/2040-8986/ac4e5f

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…The dynamics of the effective radius of the beam agrees well with its properties in a cubic medium (see, Ref. [9]) given by Equation (7). However, the relationship between the position of the centers of phase singularities and the effective radius dynamics is still an unexplored question that requires further investigation and discussion.…”

Section: Discussionsupporting

confidence: 66%

“…The initial beam radius chosen was r 0 = 1 mm. The topological charge M measured on a finite aperture in the experiment can be calculated as a phase integral over a closed loop C in the beam profile, which covers the region of interest [7,9,12]:…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the topics on how optical medium nonlinearity affects the topological charge of a propagating laser radiation and the possibility of using TC as a communication channel have been less explored. Meanwhile, the vortex beam in a turbulent medium is known to be unstable [7][8][9][10][11], i.e., it splits upon propagation into several vortices with different TCs, while the character of their spatial distribution becomes chaotic, which becomes a big challenge given realistic restrictions on the aperture of a receiving optics. This problem can be overcome to a greater or lesser degree by superimposing phase plates (including focusing different types).…”

Section: Introductionmentioning

confidence: 99%

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Vortex Beam in a Turbulent Kerr Medium for Atmospheric Communication

Bulygin

Geints

2023

Photonics

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The dynamics of the topological charge of a vortex optical beam propagating in turbulent air while accounting for the cubic nonlinearity is theoretically considered. In a number of examples, we show that the optical beam, self-focusing, manifests itself ambiguously depending on the optical wave power. At near-critical values of beam power, self-focusing leads to enhanced spatial localization of optical vortices and substantial suppression of vortex walk-off relative to the beam axis caused by air turbulence. However, with increasing optical intensity, the modulation instability imposed by cubic nonlinearity becomes significant and contributes jointly with medium turbulence and leads to faster divergence of vortex beams.

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Section: Discussionsupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vortex Beam in a Turbulent Kerr Medium for Atmospheric Communication

Bulygin

Geints

2023

Photonics

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“…Many novel applications in linear and nonlinear PT symmetry optics systems have been demonstrated, such as the localization of light, unidirectional transmission, and information encryption [36][37][38][39][40]. The nonlinear collapse and evolution of different types of beams in PT-symmetrically modulated nonlinear media have recently been studied [10,[41][42][43]. The PT-symmetric potential mainly affects the collapse of light beams through two mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Collapse Dynamics of Vector Vortex Beams in Kerr Medium with Parity–Time-Symmetric Lattice Modulation

Zan,

Yao,

et al. 2024

Photonics

Self Cite

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Based on the two-dimensional (2D) nonlinear Schrödinger equation, we investigate the collapse dynamics of a vector vortex optical field (VVOF) in nonlinear Kerr media with parity–time (PT)-symmetric modulation. The critical power for the collapse of a VVOF in a Kerr-ROLP medium (Kerr medium with a real optical lattice potential) is derived. Numerical simulations indicate that the number, position, propagation distance, and collapse profile of the collapse of a VVOF in sine and cosine parity–time-symmetric potential (SCPT) Kerr media are closely related to the modulation depth, initial powers, and the topological charge number of a VVOF. The VVOF collapses into symmetric shapes during propagation in a Kerr-ROLP medium, and collapse shapes are sensitively related to the density of the PT-symmetric optical lattice potential. In addition, due to gain–loss, the VVOF will be distorted during propagation in the Kerr-SCPT medium, forming an asymmetric shape of collapse. The power evolution of the VVOF in a Kerr-SCPT medium as a function of the transmission distance with different modulating parameters and topological numbers is analyzed in detail. The introduction of PT-symmetric optical lattice potentials into nonlinear Kerr materials may provide a new approach to manipulate the collapse of the VVOF.

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Vectorial manipulation of twisted vector vortex optical fields in strongly nonlocal nonlinear media

Liu,

Hu,

et al. 2024

Laser Phys. Lett.

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We theoretically investigate the propagation properties and vectorial manipulation of twisted vector vortex beams (TVVB) with a cross-phase in a strongly nonlocal nonlinear medium (SNNM). The root mean square beam-width (RMS-BW) and the critical power required to retain the invariant RMS-BM of the TVVB in an SNNM are derived using the coupled nonlocal nonlinear Schrödinger equation. Numerical calculations reveal novel characteristics of the evolution of the state of polarization (SoP) and the optical intensity distributions during the TVVB propagating in an SNNM. It is found that mode conversions between a Laguerre Gaussian and a Hermite Gaussian mode take place during propagation in an SNNM, and the topological charge of the TVVB can be accurately measured by observing the interference intensity structure in the cross-section. Manipulation of the beam shape, SoP, and rotation of the TVVB is achieved by controlling factors such as the initial power, twisting coefficient, initial beam-width, and topological charge. These findings hold promise for applications in optical micro-manipulation, optical communication, and material processing.

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Propagation dynamics of vector vortex beams in a strongly nonlocal nonlinear medium with parity-time-symmetric potentials

Cited by 7 publications

References 30 publications

Vortex Beam in a Turbulent Kerr Medium for Atmospheric Communication

Vortex Beam in a Turbulent Kerr Medium for Atmospheric Communication

Collapse Dynamics of Vector Vortex Beams in Kerr Medium with Parity–Time-Symmetric Lattice Modulation

Vectorial manipulation of twisted vector vortex optical fields in strongly nonlocal nonlinear media

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