We discuss a technique to invert the helicity of generic C points and generate its orthogonal state of polarization in a single step through a fork grating (FG). It is experimentally demonstrated that the beam in each of its diffraction orders possesses a degenerate C point index state. The diffraction phenomenon reported is helicity-dependent, in which left and right-handed ellipse field singularities are separated. The orthogonal polarization state of the input singularity is produced in one of the first diffracted orders of the grating. For every singularity that the grating produces, its orthogonal polarization state is also available in one of its diffraction orders. In contrast to a half-wave plate, where helicity inversion is accompanied by index inversion, a FG inverts helicity without inverting the index. Therefore, a FG can be used to perform multi-functions under generic C point illumination.

我们讨论了一种通过叉形光栅 (FG) 在单个步骤中反转通用 C 点的螺旋度并生成其正交偏振状态的技术。实验证明，每个衍射级的光束都具有简并的 C 点折射率状态。报告的衍射现象与螺旋度有关，其中左旋和右旋椭圆场奇点是分开的。输入奇点的正交偏振态是在光栅的第一级衍射级之一中产生的。对于光栅产生的每个奇点，其正交偏振态也可用于其衍射级之一。与螺旋度反转伴随指数反转的半波片相反，FG 反转螺旋度而不反转指数。所以，