Browsing by Subject "Cylindrical vector beam"

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    Generation of cylindrical vector beams with few-mode fibers excited by Laguerre–Gaussian beams
    (Elsevier, 2004-07-01) Volpe, Giovanni; Petrov, D.
    We propose a novel method to efficiently produce light beams with radial, azimuthal, and hybrid polarization, through a few-mode fiber excited by a Laguerre–Gaussian beam. With different input polarization we can selectively excite different combinations of modes from the LP11 group. We propose to show how to transform the output beam into a cylindrical vector beam in free-space through various polarization transformations.
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    Polar Policryps diffractive structures generate cylindrical vector beams
    (American Institute of Physics Inc., 2015) Alj, D.; Paladugu, S.; Volpe, G.; Caputo, R.; Umeton, C.
    Local shaping of the polarization state of a light beam is appealing for a number of applications. This can be achieved by employing devices containing birefringent materials. In this article, we present one such enables converting a uniformly circularly polarized beam into a cylindrical vector beam (CVB). This device has been fabricated by exploiting the POLICRYPS (POlymer-LIquid CRYstals-Polymer-Slices) photocuring technique. It is a liquid-crystal-based optical diffraction grating featuring polar symmetry of the director alignment. We have characterized the resulting CVB profile and polarization for the cases of left and right circularly polarized incoming beams.