Hari Krishna C, Roy Sourabh
Appl Opt. 2018 May 10;57(14):3853-3858. doi: 10.1364/AO.57.003853.
We have demonstrated a method for the generation of spiral vector beams using a few-mode optical fiber. The beams are generated due to the combination of orthogonal linearly polarized modes with a tilted polarization vector in the few-mode optical fiber. The excitation of these modes is controlled by the incident state of polarization and coupling conditions at the input end of the fiber. The beams with clockwise and counterclockwise nature of spiral polarization are generated, and switching between them is demonstrated. The obtained results emphasize the strong dependency of polarization of generated spiral vector beams and other orthogonal linearly polarized modes on the input state of polarization. The simulated results of mode mixing are verified experimentally with good agreement.
我们展示了一种使用少模光纤产生螺旋矢量光束的方法。这些光束是由于少模光纤中正交线偏振模与倾斜偏振矢量的组合而产生的。这些模式的激发由光纤输入端的入射偏振态和耦合条件控制。产生了具有顺时针和逆时针螺旋偏振特性的光束，并演示了它们之间的切换。所得结果强调了所产生的螺旋矢量光束和其他正交线偏振模的偏振对入射偏振态的强烈依赖性。模式混合的模拟结果通过实验得到了很好的验证。
