Fig. 1: GRIN beam shaping.
From: Common elements for uncommon light: vector beams with GRIN lenses
A cascade of GRIN lenses (blue) with other polarization modulating optics (black) sandwiched in between results in exotic forms of vectorial structured light carrying phase and polarization vortices. Similar configurations can be used to deliver tightly focused beams and to collect light for fast polarimetry.
