Results 11 to 20 of about 10,295 (216)

Propagation characteristics of the vortex beam array through anisotropic non-Kolmogorov maritime atmospheric turbulence

Frontiers in Physics, 2023
This study employs the power spectrum inversion method to generate the phase screens of atmospheric turbulence over the sea, the theoretical model of the vortex beam array emitted by a focusing system through anisotropic non-Kolmogorov maritime ...
Hong Yu, Hong Yu, Bowen Yang, Hanyin Hu, Zheqiang Zhong, Bin Zhang   +5 more
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Second-Harmonic Generation of the Vortex Beams with Integer and Fractional Topological Charges

Photonics, 2023
The single-pass second-harmonic generation (SHG) of a vortex beam under low fundamental wave depletion is systematically studied. Vortex modes at 1064 nm with integer topological charges from ±1 to ±9 and fractional ones at ±0.75 are generated by ...
Shirui Zhang, Weizhou Hou, Xin Tao, Minghao Guo, Yueqing Li, Peng Li   +5 more
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Effects of Turbulence on the Vortex Modes Carried by Quasi-Diffracting Free Finite Energy Beam in Ocean

Journal of Marine Science and Engineering, 2020
By developing new wave structure function of a beam waves, we derive the transmitting probability of signal vortex modes in oceanic turbulence based on Rytov approximation theory.
Qiyong Liang, Yixin Zhang, Dongyu Yang
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Mitigating the cross talk of orbital angular momentum modes in free-space optical communication by using an annular vortex beam and a focusing mirror

Frontiers in Physics, 2022
The probability density analysis formula of the single orbital angular momentum (OAM) mode of an annular vortex beam with a focusing mirror in a turbulent atmosphere is derived theoretically, and the effects of different parameters on the OAM spectrum ...
Jiaxuan Cao, Huijian Liang, Yunqin Zhou, Gaofeng Wu, Xiaoyan Pang   +4 more
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Topological charge of optical vortices in the far field with an initial fractional charge: optical "dipoles"

Компьютерная оптика, 2022
In this work, using the Rayleigh-Sommerfeld integral and the Berry formula, the topological charge (TC) of a Gaussian optical vortex with an initial fractional TC is calculated. It is shown that for different fractional parts of the TС, the beam contains
A.G. Nalimov, V.V. Kotlyar
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Synthesis and Measurement of a Circular-Polarized Deflection OAM Vortex Beam With Sidelobe Suppression Array

IEEE Access, 2020
In this paper, a chamfer distribution antenna array is designed to generate a deflecting circular-polarized vortex beam carrying orbital angular momentum (OAM) mode.
Jun Liang, Zhongliang Jing, Qiang Feng, Yushan Zheng, Long Li   +4 more
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Vortex beam generation with variable topological charge based on a spiral slit

Nanophotonics, 2019
We propose a vortex beam generator based on a nanometer spiral slit and explore the propagation rule of the topological charge. Compared to the common methods of generation of a vortex beam with a fixed topological charge, the optical vortex generated by
Wang Han, Liu Lixia, Zhou Changda, Xu Jilian, Zhang Meina, Teng Shuyun, Cai Yangjian   +6 more
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Physical Essence of Propagable Fractional‐Strength Optical Vortices in Free Space

Advanced Photonics Research, 2023
Fractional‐order vector vortex beams (VVBs) have recently been demonstrated as new carriers of fractional‐strength optical vortices. However, the inherent mechanism of the new vortex beams, formed by the combination of both unstable states, to propagate ...
Xiaoyu Weng, Yu Miao, Yu Chen, Qiang Song, Liwei Liu, Jun He, Changrui Liao, Yiping Wang, Xiumin Gao, Junle Qu, Songlin Zhuang   +10 more
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Helicity and topological charge tunable optical vortex based on a Hermite-Gaussian beam dynamically controlled folded-cavity resonator

Frontiers in Physics, 2023
Helicity and topological charge are two important characteristic parameters for vortex beam applications, including optical communications, optical manipulation and material processing, etc.
Shibing Lin, Shibing Lin, Deen Wang, Deen Wang, Yamin Zheng, Yamin Zheng, Liquan Guo, Liquan Guo, Yifan Zhang, Yifan Zhang, Yongchen Zhuang, Yongchen Zhuang, Lei Huang, Lei Huang   +13 more
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Multichannel terahertz quasi-perfect vortex beams generation enabled by multifunctional metasurfaces

Nanophotonics, 2022
Vortex beams carrying orbital angular momentum (OAM) open a new perspective in various terahertz research. Multichannel and divergence controllable terahertz vortex beam generation holds the key to promoting the development of OAM related terahertz ...
Liu Wanying, Yang Quanlong, Xu Quan, Jiang Xiaohan, Wu Tong, Gu Jianqiang, Han Jiaguang, Zhang Weili   +7 more
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