Pelarization-preserving angular shifter

Abstract

This study shows that by using a wedge plate the incident direction of light propagation can be rotated as desired while still preserving beam polarization. This study also deduces the basic condition of this preservation of polarization. Two typical wedge plates are analyzed for nume:rical demonstration. Simulation results verify that a collimated beam with a +45' linear polarization can be guided to an expected direction while preserving the state of polarization with a square of the variation of the ellipse ratio of less than 0.0001%. This study also numerically shows that the wedge vertex angle is the most critical issue and that approximately 0.1* accuracy is required to preserve the polarization state. (c) 2008 Optical Society of America