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Complex beam shaping based on an equivalent q-plate system and analysis of its properties using digital holography polarization imaging

机译:基于等效q板系统的复杂光束整形及其数字全息偏振成像特性分析

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摘要

In this study, we generate various complex beams carrying angular momentum (AM) by using a programmable beam shaping system to mimic typical q-plates. When a circularly polarized wave is incident onto the system, the emerging beam reverses its spin handedness and obtains a spatial phase factor. This phase factor can be engineered by designing a computer-generated hologram (CGH) and applying it to a spatial light modulator (SLM) to produce a beam with controllable spatially distributed orbital angular momentum (OAM) density. To determine the properties of the generated fields, we combine digital holography (DH) with the beam shaping system to yield visualizations of the beam intensity, phase, and AM distributions over the transverse plane at different propagation distances. Comparisons of the theoretically and experimentally obtained results show good qualitative agreement. This study advances our understanding and interpretation of AM characteristics produced by a programmable q-plate-like system.
机译:在这项研究中,我们通过使用可编程光束整形系统来模拟典型的q板,生成了各种携带角动量(AM)的复杂光束。当圆偏振波入射到系统上时,射出的光束会反转其自旋性,并获得空间相位因子。可以通过设计计算机生成的全息图(CGH)并将其应用于空间光调制器(SLM)来产生具有可控的空间分布的轨道角动量(OAM)密度的光束来设计此相位因子。为了确定所产生场的特性,我们将数字全息术(DH)与光束整形系统结合起来,以可视化的方式观察了横梁在不同传播距离下的光束强度,相位和AM分布。从理论上和实验上获得的结果的比较显示出良好的定性一致性。这项研究提高了我们对可编程q板状系统产生的AM特性的理解和解释。

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