摘要
本文提出了一种生成2×2双环构型轨道角动量(OAM)光束阵列的新方法。通过在四个不同的位置对具有不同拓扑参数的拉盖尔-高斯(LG)模式轨道角动量光束共轴叠加,可生成一种具有多样化光束分布和精细化拓扑信息的2×2双环OAM光束阵列。基于目标导向的共轭对称延拓Fourier计算全息法,快速编码产生2×2双环OAM光束阵列的计算全息图(CGH),并通过数值仿真计算及基于反射式空间光调制器(SLM)的光电实验对上述方法进行了有效验证,光电实验结果与数值重建结果保持高度一致。本研究成功地提出了一种产生双环结构2×2 OAM光束阵列的方法,该方法采用较低复杂度的实验方案,不仅实现简单,而且具备良好的扩展性。在该阵列中,每个位置的双环OAM光束内外环均可携带整数或分数阶拓扑参数,内外环保持相互独立,可实现对拓扑参数的精细化控制。与传统的单模态或复合态OAM光束相比,本文产生的2×2双环OAM光束阵列极大地丰富了复合OAM光束的光分布式模式,能够承载更加精细化的拓扑信息,因此在微观粒子捕获、光信息编码与传输等多领域具备较为显著的应用前景。
In this paper,a novel method for generating a 2×2 dual-ring shaped orbital angular momentum beam array is proposed.By axially overlapping four Laguerre-Gaussian(LG)modes with different topological parameters at four different positions,a 2×2 dual-ring OAM beam array with diverse beam distributions and fine-tuned topological information is generated.The CGH(Computer-generated hologram)of the 2×2 dual-ring OAM beam array is produced using the conjugate-symmetric-extension Fourier transform method targeted at the object beam array,and the method is validated through numerical simulation and optical experiment based on a reflective SLM(Spatial Light Modulator).The experimental results are highly consistent with the reconstructed numerical results.This study successfully proposed a method for generating a dual-ring structure 2×2 OAM beam array,which employs a lower complexity experimental scheme,offering not only simple implementation but also good scalability.In this array,both the inner and outer rings of the dual-ring OAM beams at each position can carry integer or fractional-order topological parameters,and the inner and outer rings remain independent,enabling refined control over the topological parameters.Compared with traditional single-modal or composite OAM beams,the 2×2 dual-ring OAM beam array generated in this study greatly enriches the distributed mode of composite OAM beams and can carry more fine-tuned topological information,thus having significant application potential in many fields such as particle trapping,optical information coding and transmission.
作者
贺超
刘军
李振宇
HE Chao;LIU Jun;LI Zheng-yu(The 38th Institute of CETC,Hefei 230000,China;The 63768 Unit of the PLA,Xi'an 710600,China;The 61191 Unit of the PLA,Hangzhou 310000,China)
出处
《激光与红外》
2025年第8期1279-1284,共6页
Laser & Infrared
基金
国家重点研发计划“多模态网络与通信”重点专项项目(No.2021YFB2900600)资助。
作者简介
贺超(1989-),男,硕士,工程师,主要从事通信信息系统、光学信息处理等方面的研究。E-mail:hzy191022@163.com。
