Results 11 to 20 of about 70,968 (286)

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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Controlling Dispersion Characteristic of Focused Vortex Beam Generation

Photonics, 2022
As an important structured beam, vortex beams have a wide range of applications in many fields. However, conventional vortex beam generators require complex optical systems, and this problem is particularly serious with regards to focused vortex beam ...
Xueshen Li, Zhigang Fan
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Theoretical and Experimental Research on the Mode Modulation Regulation for the Mode-Tunable Vortex Laser Based on Mode Conversion and Intra-Cavity Modulation

Photonics, 2022
The vortex laser beam has been widely applied in many fields for its unique properties. However, researchers have to conduct extensive and recurring experiments to find the modulation abilities of the vortex beam modes for a given resonant cavity.
Shibing Lin, Deen Wang, Shaonan Kang, Yamin Zheng, Lei Huang   +4 more
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Spiral fractional vortex beams

Optics Express, 2023
A new type of spatially structured light field carrying orbital angular momentum (OAM) mode with any non-integer topological order, referred to as the spiral fractional vortex beam, is demonstrated using the spiral transformation. Such beams have a spiral intensity distribution and a phase discontinuity in the radial direction, which is completely ...
Lixun Wu, Xuankai Feng, Zhongzheng Lin, Yuanhui Wen, Hongjia Chen, Yujie Chen, Siyuan Yu   +6 more
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Generation, Topological Charge, and Orbital Angular Momentum of Off-Axis Double Vortex Beams

Photonics, 2023
Compared with the on-axis vortex beam and the off-axis single vortex beam, the off-axis double vortex beam has more control degrees of freedom and brings rich physical properties.
Mingxian Guo, Wei Le, Chao Wang, Guanghao Rui, Zhuqing Zhu, Jun He, Bing Gu   +6 more
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Experimental study of the transport characteristics of fractional-order vortex beams in a turbulent atmosphere simulator

AIP Advances, 2023
Fractional vortex beams have attracted increasing attention due to their complex yet intriguing physical properties, such as radial notch intensity distribution and higher degrees of modulation in orbital angular momentum.
Xiang Xu, Xian-mei Qian, Chuan-kai Luo, Xiao-wei Chen, Chao-long Cui, Wen-yue Zhu   +5 more
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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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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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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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