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Generation of orbital angular momentum mode using a single cylindrical vector mode based on mode selective coupler

机译:基于模式选择耦合器的单圆柱矢量模式生成轨道角动量模式

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We deduce theoretically that arbitrary lth order cylindrical vector (CV) mode in few-mode fiber can be seen as linear combination of a left-handed and a right-handed circularly polarized orbital angular momentum (CP-OAM) modes with the opposite l, where l is the topological charge (l >= 1). And these two CP-OAM modes can be stimulated by a combination of a quarter-wave plate (QWP) and a polarizer with an angle +/- pi/4. Thus, using a single CV mode, the orbital angular momentum of light can be switched among -l, 0, l. As an example, the generations of sigma(+)OAM(+/- l) and sigma(-)OAM(+/- l) (l=1, 2) beams are demonstrated and verified by theoretical simulation and experiment. Compared to the conventional combination of eigenmodes pairs to generate OAM beams, this approach not only provides an increased stability, but also builds a bridge between polarization singularities mode and phase singularities mode, due to using a single CV mode as the light source.
机译:我们从理论上推论,少数模光纤中的任意l阶圆柱矢量(CV)模式可以看作是左旋和右旋圆偏振轨道角动量(CP-OAM)模式与l相反的线性组合,其中l是拓扑电荷(l> = 1)。四分之一波片(QWP)和角度为+/- pi / 4的偏振器的组合可以激发这两种CP-OAM模式。因此,使用单个CV模式,可以在-l,0,l之间切换光的轨道角动量。例如,通过理论模拟和实验证明并验证了sigma(+)OAM(+/- l)和sigma(-)OAM(+/- l)(l = 1,2)光束的产生。与使用本征模式对生成OAM光束的常规组合相比,该方法不仅提供了更高的稳定性,而且由于使用单个CV模式作为光源,因此在偏振奇异模式和相位奇异模式之间架起了一座桥梁。

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