Generation of Perfect Vortex Beams and Space Free-Control Technology

Xinzhong, 李新忠 Li; Ying, 孟莹 Meng; Hehe, 李贺贺 Li; Jingge, 王静鸽 Wang; Chuanlei, 尹传磊 Yin; Yuping, 台玉萍 Tai; Hui, 王辉 Wang; Liping, 张利平 Zhang

doi:10.3788/aos201636.1026018

Cited by 3 publications

(1 citation statement)

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“…The most commonly used method for creating the PVB is Fourier transformation of the Bessel vortex beam [19][20][21], which is usually replaced by a BG vortex beam in reality. Here, the BG vortex beam is usually created by a computer-controlled liquid-crystal spatial light modulator (SLM) [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] or digital micromirror device (DMD) [35], a special designed hybrid phase plate [36], a transparent variable diffractive spiral axicon based on a single liquid-crystal cell [37], polymer-based phase plate [38], metasurface [39], Pancharatnam-Berry phase element [40], axicon [41][42][43], or diffraction of the BG vortex beam by using curved fork grating [44], and so on. In addition, the PVB can be directly generated by schemes including a computer-generated hologram (CGH) displayed on the reflective phase SLM [45][46][47][48] or the DMD [49,50], a radial phase shift spiral zone plate [51,52], a planar Pancharatnam-Berry (PB) phase element [53], or metasurfaces [54][55][56][57]…”

Section: Introductionmentioning

confidence: 99%

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Tao,

Liang,

Zhang

et al. 2023

Photonics

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We have experimentally created perfect vortex beams (PVBs) by Fourier transformation of Bessel–Gaussian vortex beams, which are generated by modulating the fundamental Gaussian beam with the spiral phase plates and the axicons, respectively. Although the method has been used many times by other authors, as far as we know, few people pay attention to the quantitative relationship between the control parameters of the PVB and ring width. The effects of the waist radius of the fundamental Gaussian beam wg, base angle of the axicon γ, and focal length of the lens f on the spot parameters (ring radius ρ, and ring half-width Δ) of PVB are systematically studied. The beam pattern of the generated Bessel–Gaussian beam for different propagation distances behind the axicon and the fundamental Gaussian beam wg is presented. We showed experimentally that the ring radius ρ increases linearly with the increase of the base angle γ and focal length f, while the ring half-width Δ decreases with the increase of the fundamental beam waist radius wg, and increases with enlarging the focal length f. We confirmed the topological charge (TC) of the PVB by the interferogram between the PVB and the reference fundamental Gaussian beam. We also studied experimentally that the size of the generated PVB in the Fourier plane is independent of the TCs. Our approach to generate the PVB has the advantages of high-power tolerance and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Tao,

Liang,

Zhang

et al. 2023

Photonics

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Generation and propagation properties of Bessel–Gaussian beams with a rotationally symmetric power-exponent-phase vortex

Pan,

Dou,

et al. 2024

J. Opt. Soc. Am. A

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In this paper, the generation and propagation properties of Bessel–Gaussian (BG) rotationally symmetric power-exponent-phase vortex beam (RSPEPVBs) were demonstrated and discussed. The results showed that the BG-RSPEPVBs can be directly generated based on the spatial light modulator, of which the phase singularities were verified by the interference patterns with the plane wave. It can be found that the intensity distributions of the BG-RSPEPVBs, with different topological charges (TCs) and power orders, were fan-shaped and polycyclic, which possessed the characteristics of BG beams and RSPEPVBs, simultaneously. Thus, the propagation invariance of the BG-RSPEPVBs is better than that of Laguerre–Gaussian RSPEPVBs and RSPEPVBs. Moreover, the focusing spot of the BG-RSPEPVBs would evolve into a bright ring with the same ring radius at the focal plane, which is independent of the TC and more suitable for the applications of optical coupling, optical communication, optical trapping, and so on.

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完美涡旋光束在大气湍流传输中的螺旋相位谱分析

Li Siyao,

Ding Zhoulin,

Hou Chunyu

et al. 2024

光学学报

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Objective Vortex beam is a beam that carries orbital angular momentum (OAM). The perfect vortex beam (PVB) is a new type of beam that has emerged in recent years. Compared with other traditional vortex beams, the PVB has the property that the radius of the optical ring does not increase with the increase in OAM mode, which has attracted much attention in the field of freespace optical communication. Moreover, the different OAM modes of the vortex beam are orthogonal to each other and can be used to expand the channel capacity of optical communication systems. The OAM dimension of the vortex beam can also be used for signal coding, and since the number of modes of OAM modes is not limited (it can be any integer), it is theoretically possible to carry an infinite amount of bits of information in a single code element. However, vortex beam transmission in the atmosphere will be affected by atmospheric turbulence and produce distortion, and atmospheric turbulence makes its light intensity distribution uneven. Spiral phase distortion can result in the 研究论文第 44 卷第 6 期/2024 年 3 月/光学学报 transmitted to the far field, and the quantum number difference is 1, larger OAM mode at the emission indicates higher crosstalk probability. The crosstalk probability occurs mainly between two neighboring OAM states (Fig. 3). Furthermore, the variation of PVB light intensity with distance in atmospheric turbulence can reveal the evolution of the PVB light field (Fig. 4). In addition, the crosstalk probability curve of PVB has a significant feature in the state with a large refractive index structure constant near the ground: it first increases to a maximum with the transmission distance and then slowly decreases (Fig. 5).Conclusions In this paper, an analytical expression for the spiral phase spectrum of a PVB under non -Kolmogorov turbulence is derived theoretically. Theoretical models of OAM modal detection probability and crosstalk probability are developed. The results show that the atmospheric turbulence significantly causes the spiral phase spectrum expansion of the PVB. The detection probability curve of the PVB in the near field hardly varies with the OAM mode at the transmitter, while it varies significantly with the OAM mode at the transmitter when the beam is transmitted to the far field. This is because the PVB transmitted to the far field becomes a Bessellike beam, and its beam radius varies significantly with the OAM mode at the transmitter. Moreover, a long transmission distance of the PVB beam indicates a more severe negative impact of atmospheric turbulence. The detection probability of the beam after atmospheric turbulent transport decreases as the number of OAM modes at the transmitter, beam radius, refractive index structure constant near the ground, and turbulence coefficient increase. As the beam wavelength increases, the detection probability of the PVB after atmospheric turbulent transport increases. These results provide a certain reference value for the implementation of PVBs in atmospheric turbulence for optic...

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Generation of Perfect Vortex Beams and Space Free-Control Technology

Cited by 3 publications

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Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Generation and propagation properties of Bessel–Gaussian beams with a rotationally symmetric power-exponent-phase vortex

完美涡旋光束在大气湍流传输中的螺旋相位谱分析

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