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Controlling orbital angular momentum using forked polarization gratings
Laser Beam Shaping XI
We examine a novel method to control the orbital angular momentum (OAM) of lightwaves using forked polarization gratings (FPGs). We significantly improve the fabrication of FPGs and achieve substantially higher quality and efficiency than prior work. This is obtained by recording the hologram of two orthogonally polarized beams with phase singularities introduced by q-plates. As a single compact thin-film optical element, an FPG can control the OAM state of light with higher efficiency anddoi:10.1117/12.861125 fatcat:ck6vk2a7wvcnfgkbryrubquzpe