Patent ID: 7619817

Claim:
A polarization filter utilizing Brewster's angle, comprising a light receiving body having an input end with a plurality of planarfacets, at least two of the plurality of planar facets being arranged at Brewster's angle relative to an optical axis along which light from an incident stimulus of collimated electro-magnetic radiation projected concurrently from a single direction onto the input end passes after striking the plurality of planar facets of the body, the plurality of planar facets are positioned in different radial orientations, relative to the optical axis, to provide simultaneous differential transmission or simultaneous differential reflection of different polarization planes in the light projected from the incident stimulus, and the different polarization planes, which are transmitted through or reflected by the plurality of planar facets, are each oriented in one of at least three different orientations relative to the optical axis, wherein the at least one of the individual facets being positioned perpendicular to the optical axis, has a surface extending perpendicular to both the incident stimulus and the optical axis, is located between two adjacent facets, which are arranged at Brewster's angle relative to the optical axis, and is provided as a comparative reference.