| http://www.w3.org/ns/prov#value | - Generally, as the polarization beam splitter 3, mainly used is a type which is proposed by S. M. MacNeille in U.S. Pat. No. 3,346,319 and in which two glass prisms are attached together to form a cube or a rectangular parallelepiped, and a multilayer optical thin film is formed at the interface of the two glass prisms.
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