Polarization preserving optical systems

TLDR: Polarization preserving optical systems as discussed by the authors can be used in the field of distance measuring interferometry (DMI) to enhance measurement accuracy by reducing undesirable polarization effects that can introduce errors associated with an otherwise present undesirable polarization rotation found in classical retroreflectors.

Abstract: Polarization preserving optical systems for use in deviating plane polarized beams (371, 372) through preselected angles without changing their linear state of polarization. A plurality of reflecting surfaces are arranged such that the light incident thereon is always P-polarized or S-polarized. Prismatic optical elements (310, 320, 330, 340) are preferably used to construct assemblies including mirrored surfaces and/or total internal reflection (TIR) surfaces. The assemblies can also include polarization beam splitting coating arrangements and/or birefringent materials to enhance the extinction ratio between orthogonally polarized beams propagating through such systems. The optical systems have a variety of applications and are particularly suitable for use in the field of distance measuring interferometry (DMI) to enhance measurement accuracy by reducing undesirable polarization effects that can introduce errors associated with an otherwise present undesirable polarization rotation found in classical retroreflectors. Non-retroreflecting embodiments are also presented.