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Abstract

A polarization rotating optical device is provided. The device comprises a prism configured to accept an input collimated optical beam and redirect the beam by means of total internal reflection at three or more faces of the prism. The first face reflects an incident collimated beam at an angle of 90 degrees with respect to the original beam direction. The incident and reflected beams are comprised of orthogonal s and p polarized components, where the s and p directions are defined with respect to the plane containing the incident and reflected beam directions in the conventional manner. One or more prism faces then reflect the beam within the plane normal to the incident beam. The sum of the included angles of these reflections must total an odd multiple of 90 degrees. The final prism face reflects the beam by 90 degrees in a third plane orthogonal to the planes of the preceding reflection. The resulting exit beam is parallel to the incident beam and has the s and p polarization components are interchanged with respect to the polarization components of the incident beam.

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First Claim