Mamani Sandra, Bendau Ethan, Secor Jeff, Ashrafi Solyman, Tu Jiufeng J, Alfano Robert R
Appl Opt. 2017 Mar 10;56(8):2171-2175. doi: 10.1364/AO.56.002171.
A method is described for generating optical vector vortex beams carrying superpositions of orbital angular momentum states by using a tandem application of a spatial light modulator with a vortex retarder. The vortex component has a spatially inhomogeneous phase front that can carry orbital angular momentum, and the vector nature is a spatially inhomogeneous state of polarization in the laser beam profile. The vector vortex beams are characterized experimentally by imaging the beams at points across the focal plane in an astigmatic system using a tilted lens. Mathematical analysis of the Gouy phase shows good agreement with the phase structure obtained in the experimental images. The polarization structure of the vector beam and the orbital angular momentum of the vortex beam are shown to be preserved.
描述了一种通过将空间光调制器与涡旋延迟器串联应用来生成携带轨道角动量态叠加的光学矢量涡旋光束的方法。涡旋分量具有可携带轨道角动量的空间不均匀相位前沿，并且矢量特性是激光束轮廓中空间不均匀的偏振态。通过使用倾斜透镜在像散系统中对焦平面上各点的光束进行成像，对矢量涡旋光束进行了实验表征。古依相位的数学分析与实验图像中获得的相位结构显示出良好的一致性。结果表明，矢量光束的偏振结构和涡旋光束的轨道角动量得以保留。
