Mr. Liyuan Xu Profile

Liyuan Xu

at Space Engineering Univ

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Proceedings Article | 27 March 2022 Paper

Two-dimensional imaging method based on orbital angular momentum of optical vortex

Liyuan Xu, Linlin Chen, Yuan Ren, Zhengliang Liu, Tong Liu, Yining Wang

Proceedings Volume 12169, 121692X (2022) https://doi.org/10.1117/12.2623368

KEYWORDS: Optical vortices, Radar imaging, Bessel functions, Electromagnetism, Imaging systems, Radar

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Vortex beam is a new structured light field with a spiral wavefront. Because of carrying orbital angular momentum (OAM) information, vortex beam has a higher degree of freedom of information modulation than traditional laser. It has great application potential in inertial measurement and radar imaging fields. In this paper, we firstly propose a method for two-dimensional imaging based on orbital angular momentum of vortex. Firstly, an imaging model of vortex is established based on linear frequency modulation signal. In the distance direction, pulse compression is achieved by dechirping (The target signal light and the local oscillation light are heterodyne mixed, and amplitude and phase information are obtained by detector).In the azimuth direction, vortex beams carrying different orbital angular momentum l (i.e. topological charge) are emitted, and the target azimuth information represented in frequency domain is obtained by Fourier transform using the approximate duality between the orbital angular momentum spectrum and azimuth variable. The simulation results show that this method can distinguish the point target well and isolate the noise to a certain extent, which lays a foundation for the application of optics vortex in radar target imaging.

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