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arXiv 1705.04478physics.optics
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庞加莱光束的散射:偏振散斑

Scattering of Poincare beams: polarization speckles

Salla Gangi Reddy, Vijay Kumar, Yoko Miyamoto, R. P. Singh

摘要:

偏振散斑是具有空间变化的随机偏振轮廓的细颗粒光图案。我们利用庞加莱光束(一类特殊的矢量涡旋光束)通过毛玻璃板的散射产生这些散斑图。这里,庞加莱光束是使用偏振敏感空间光调制器产生的,该空间光调制器显示对应于光学涡旋相位分布的轴上全息图。粗糙表面的不同不均匀性经历不同的偏振,其控制散射波在检测平面处干涉的能力,并导致空间变化的偏振分布。我们实验确定了这些散斑图的局部偏振度和偏振椭圆方向的空间变化从斯托克斯分析。利用Stokes参量S0的自相关函数确定标量散斑的大小,利用其余三个Stokes参量的自关联函数之和确定偏振散斑的大小。我们发现标量散斑的大小与矢量光束的折射率无关,但偏振散斑的大小随矢量光束折射率的增加而减小。

英文摘要:

Polarization speckle is a fine granular light pattern having spatially varying random polarization profile. We generate these speckle patterns by using the scattering of Poincaré beams, a special class of vector vortex beams, through a ground glass plate. Here, the Poincaré beams are generated using a polarization sensitive spatial light modulator displaying an on-axis hologram corresponding to an optical vortex phase profile. The different inhomogeneities of the rough surface experience different polarizations, which control the ability for scattered waves to interfere at the detection plane and causes a spatially varying polarization profile. We experimentally determined the spatial variation of local degree of polarization and orientation of the polarization ellipse for these speckle patterns from the Stokes analysis. We also determined the size of scalar speckles using the auto-correlation function of Stokes parameter S0 and the size of polarization speckles using the sum of auto-correlation functions of remaining three Stokes parameters. We found that the scalar speckle size is independent of index of the vector beam but the size of polarization speckles decreases with the increase in index of the vector beam.

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