Manthalkar Amogh, Nape Isaac, Bordbar Najmeh Tabe, Rosales-Guzmán Carmelo, Bhattacharya Shanti, Forbes Andrew, Dudley Angela
Opt Lett. 2020 Apr 15;45(8):2319-2322. doi: 10.1364/OL.389346.
Stokes polarimetry is widely used to extract the polarization structure of optical fields, typically from six measurements, although it can be extracted from only four. To measure the required intensities, most approaches are based on optical polarization components. In this work, we present an all-digital approach that enables a rapid measure of all four intensities without any moving components. Our method employs a polarization grating (PG) to simultaneously project the incoming mode into left- and right-circular polarized states, followed by a polarization-insensitive digital micromirror device (DMD), which digitally introduces a phase retardance for the acquisition of the remaining two polarization states. We demonstrate how this technique can be applied to measuring the SoP, vectorness, and intramodal phase of optical fields, without any moving components, and shows excellent agreement with theory, illustrating fast, real-time polarimetry.
斯托克斯偏振测量法被广泛用于提取光场的偏振结构，通常需要进行六次测量，不过也可以仅通过四次测量来提取。为了测量所需的强度，大多数方法都基于光偏振分量。在这项工作中，我们提出了一种全数字方法，该方法能够在没有任何移动部件的情况下快速测量所有四个强度。我们的方法采用一个偏振光栅（PG）将入射模式同时投影到左旋和右旋圆偏振态，随后是一个偏振不敏感数字微镜器件（DMD），它通过数字方式引入相位延迟以获取其余两个偏振态。我们展示了该技术如何在没有任何移动部件的情况下应用于测量光场的偏振态（SoP）、矢量性和模内相位，并且与理论结果高度吻合，展现了快速、实时的偏振测量。
