We present a new scheme to produce a tunable converge elliptical optical vortex (EOV) with a phase-only element: elliptical helical lens (EHL), which is studied theoretically and experimentally. As a result, the properties of converge EOVs can be controlled by adjusting the parameters of EHL. The topological charges of the EOVs can be directly read from the received intensity pattern. Because EHL is a hologram programmed in space light modulator (SLM), converge EOVs can be controlled just by reprogramming the SLM instead of replacing actual instruments. This work has potential applications in particle manipulation, as well as generation of OAM-entangled photons.

中文翻译：

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基于椭圆螺旋透镜的可调会聚光学椭圆涡

我们提出了一种新方案，用于产生具有仅相位元件的可调会聚椭圆光学涡旋 (EOV)：椭圆螺旋透镜 (EHL)，对其进行了理论和实验研究。因此，可以通过调整 EHL 的参数来控制收敛 EOV 的特性。EOV 的拓扑电荷可以直接从接收到的强度模式中读取。由于 EHL 是在空间光调制器 (SLM) 中编程的全息图，因此可以通过对 SLM 重新编程而不是更换实际仪器来控制会聚 EOV。这项工作在粒子操纵以及 OAM 纠缠光子的生成方面具有潜在应用。