Free Space Realization of the Symmetrical Tunable Auto‐Focusing Lommel Gaussian Vortex Beam

Tu, Jialong; Wang, Xinyue; Yu, Xing; Wang, Haonan; Deng, Dongmei

doi:10.1002/andp.202100419

Cited by 3 publications

(3 citation statements)

References 30 publications

(30 reference statements)

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“…When 𝜀 = 0.75 exp(i𝜋∕4), comparing Figure 3 a1,b1) with Figure 3 a5,b5, it is clear that there are still two circular breaks inside the main ring of the beam and its symmetry axis is rotated 45 • clockwise. The rotation angle of the axis of symmetry is given by 𝛿 = arg(𝜀), and arg(⋅) represents the argument of the complex number, [19] which indicates that the symmetry of LoTW can be flexibly controlled. The experimental results are in good agreement with the numerical results.…”

Section: Resultsmentioning

confidence: 99%

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Visualizing the Fractional Orbital Angular Momentum

Zhang

Liu

et al. 2023

Annalen der Physik

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This paper proposes a novel approach to visualize the fractional orbital angular amentum (OAM) flow of light fields at the example of the Lommel tornado wave (LoTW) along the propagation direction in free space. The novel approach that is based on the transverse intensity distributions of the LoTWs can be used to identify and quantify the fractional OAM. The energy that is continuously distributed flexibly is controlled via the asymmetry factor and topological charge. Furthermore, the OAM density on concentric rings and chiral paths is employed to demonstrate convincingly as a manifestation of the energy flow. Such beams are anticipated to find potential applications in optical communication and optical micromanipulation.

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Section: Resultsmentioning

confidence: 99%

“…where 𝜀 is the asymmetry factor, 𝛼 stands for a spatial distribution factor, r 0 is the main ring radius of the beam, n is the topological charge, U n (⋅) denotes Lommel function, which is expressed as [19] U Q(𝜌) is the truncation function, which can be denoted as…”

Section: Methodsmentioning

confidence: 99%

Visualizing the Fractional Orbital Angular Momentum

Zhang

Liu

et al. 2023

Annalen der Physik

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“…Yu et al investigated the detection probability of received OAM modes in anisotropic oceanic turbulence with Lommel-Gaussian beam and showed that small asymmetric parameter and topological charge benefit information transmission [38]. Tu et al proposed autofocusing Lommel-Gaussian beam and showed that the shape, symmetry and focusing distance of the beam can be well controlled by adjusting the topological charge and asymmetry factor [39]. Wang et al analyzed the capacity of UWOC links with the localized Lommel-Gaussian beams and demonstrated that the system capacity uplifts with the increment of the OAM channel number [40].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of an underwater wireless optical communication link with Lommel beam

Ma,

Wang,

Qin

et al. 2024

Phys. Scr.

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In order to mitigate the stochastic interference of underwater channels and improve the quality of underwater communication systems, it is essential to study the performance of the underwater wireless optical communication (UWOC) links utilizing vortex beams with unique attributes. In this paper, the analytical formulae for the bit error rate (BER) and the average capacity of the UWOC link with diffraction-free Lommel beam are derived under the Rytov theory. Simulation results demonstrate that the system with a long wavelength, a high system signal-to-noise ratio(SNR), a small asymmetric parameter and receiving aperture diameter achieves a high average capacity and a low BER. Furthermore, in the underwater channel with a larger kinetic energy dissipation rate per unit mass of fluid and inner scale, a smaller mean-squared temperature dissipation rate, temperature salinity contribution ratio and transmission distance, the performance of the communication link can be improved. Meanwhile, it is found that the performance of the link with carrier Lommel beam are less sensitive to the topological charge, the scaling factor of the beam and the turbulent outer scale. These findings provide theoretical support for the design and implementation of an UWOC link utilizing the Lommel beam.

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Effect of oceanic turbulence on the propagation behavior of a radially polarized Laguerre–Gaussian Schell-model vortex beam

Xu,

Liu

2023

J. Opt. Soc. Am. A

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Optical wireless communications applications are restricted by oceanic media-induced beam quality degradation. However, modulating the coherence and polarization structures of the laser beams can effectively diminish the negative influence of oceanic turbulence on the beams. The average intensity of a radially polarized Laguerre–Gaussian Schell-model vortex (RPLGSMV) beam propagating through oceanic turbulence is explored by employing the extended Huygens–Fresnel principle. We found that the average intensity of an RPLGSMV beam is greatly affected by oceanic turbulence with a large rate of dissipation of the mean-square temperature and a large relative strength of the temperature and salinity fluctuations as well as the small rate of dissipation of the turbulent kinetic energy per unit mass of fluid and small Kolmogorov microscale. It was also found that a RPLGSMV beam with a larger radial index, topological charge, initial coherent length, and beam waist has a stronger anti-turbulence ability. Our numerical findings may be of great significance for the detection and imaging of oceanic optical telecommunications links.

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Free Space Realization of the Symmetrical Tunable Auto‐Focusing Lommel Gaussian Vortex Beam

Cited by 3 publications

References 30 publications

Visualizing the Fractional Orbital Angular Momentum

Visualizing the Fractional Orbital Angular Momentum

Performance analysis of an underwater wireless optical communication link with Lommel beam

Effect of oceanic turbulence on the propagation behavior of a radially polarized Laguerre–Gaussian Schell-model vortex beam

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