Cube Polarizing Beamsplitter is an optical device that splits a beam of light in two. It is a crucial part of many optical experimental and measurement systems, such as interferometers. In its most common form, a cube is made from two triangular glass prisms which are bonded or contacted together at their base. In a polarizing beam splitter, the transmitted beam and the diverted beam will have orthogonal polarizations. If you input polarized light, then the relative amount of transmitted/diverted power will depend on the input polarization.
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