CPC H01Q 15/242 (2013.01) [G02B 5/3008 (2013.01); G02B 5/3058 (2013.01); G02B 27/285 (2013.01)] | 3 Claims |
1. A device comprising a quarter wave plate (QWP) fabricated with an artificial dielectric formed of thin spaced-apart metal plates,
wherein plates define orientation of a plane at 45° to an input vertical polarization of a process beam from a polarizing beam splitter (PBS) fabricated using artificial dielectrics,
such that half of an input energy will propagate via a TEM mode and another half via a TE1 mode such that two orthogonal polarization components acquire a one-pass relative phase of 90° at a certain frequency and a return pass relative phase of 180° upon passing back to effectively rotate a polarization axis of a reflected beam by 90°, rendering it horizontally polarized, so it is diverted in an off-axis direction by the PBS and isolated from an input-beam path, the QWP given a 12-degree tilt with respect to a beam axis.
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