Abstract
This Letter examines the diffraction of a vortex beam by a high numerical aperture of topological charge generated by conical diffraction. Our research shows the behavior of the vortex beam is similar to the one already observed for Laguerre–Gauss and Bessel beams. We also highlight a similarity between the phase singularity created by a lens and the one created by conical diffraction through a thin crystal. More precisely, if the input beam is homogeneously polarized, we show the electric field in the image plane of a thin crystal caught between two orthogonal polarizers has the same expression as , the component of the electric field along the propagation axis, in the focal plane of a lens.
© 2014 Optical Society of America
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