High-order mixed vortex beam generator

Author:

Wang Donghui1,Feng Chengcheng1,Meng Lingzhi1,Wang Hongye1ORCID,Yuan Libo2ORCID

Affiliation:

1. Harbin Engineering University

2. Guilin University of Electronic Technology

Abstract

A mixed multi-order vortex beam generator, based on a Reuleaux triangle core fiber chiral grating (RCFG), is proposed. The triangular perturbation and off-axis effects induced by core shape, result in the simultaneous coupling of the core mode with the 1st- and 3rd-order vortex modes. To the best of our knowledge, this is the first time that a mixed vortex beam was generated in a single chiral fiber. The phase matching conditions required for the co-coupling of multi-order vortex beams are analyzed based on the coupled mode theory. Additionally, a cladding shrinkage method is proposed to flexibly adjust the co-coupling wavelength. We found that the key to co-coupling lies in balancing the different order perturbations of the Reuleaux triangle core fiber (RTF). The proposed method offers a new approach for the design of mixed multi-order vortex beam generators, with potential applications in fields such as fiber OAM communications, optical tweezers, and super-resolution imaging.

Funder

National Natural Science Foundation of China

Bagui Scholars Program of Guangxi Zhuang Autonomous Region

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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