Joshi Stuti, Khan Saba N, Kanseri Bhaskar, Senthilkumaran P
Opt Express. 2022 Aug 29;30(18):32230-32243. doi: 10.1364/OE.463210.
In this work, the far-field properties of non-isotropic partially coherent vector vortex beams (PCVVBs) are investigated both theoretically and experimentally. The term non-isotropic signifies that the spatial correlations between the parallel and orthogonal electric field components are distinguishable. It is found that self-orientation and shaping of intensity profile, correlation-induced polarization and depolarization are highly dependent on both the non-isotropic correlation parameters and Poincaré-Hopf index (PHI) of the beam. The simultaneous depolarization and polarization effects are due to the difference in the input correlation parameters that alter the state of polarization (SOP) and degree of polarization (DOP) distributions. The experimental results are in good agreement with the theoretical predictions. The distinguishability of correlation parameters at the source plane leads to significant changes on its intensity profile, DOP, and SOP distributions on far-field propagation, which may found potential applications in beam shaping, detecting and imaging atmospheric lidar, optical imaging and directional transportation where the self-rotation characteristic of beam plays an important role.
在这项工作中，对非各向同性部分相干矢量涡旋光束（PCVVBs）的远场特性进行了理论和实验研究。术语“非各向同性”表示平行和正交电场分量之间的空间相关性是可区分的。研究发现，强度分布的自取向和整形、关联诱导的偏振和去偏振高度依赖于光束的非各向同性关联参数和庞加莱 - 霍普夫指数（PHI）。同时出现的去偏振和偏振效应是由于输入关联参数的差异改变了偏振态（SOP）和偏振度（DOP）分布。实验结果与理论预测吻合良好。源平面处关联参数的可区分性导致其在远场传播时强度分布、DOP和SOP分布发生显著变化，这可能在光束整形、大气激光雷达的检测与成像、光学成像以及定向传输等领域找到潜在应用，其中光束的自旋转特性起着重要作用。
