| http://www.w3.org/ns/prov#value | - The prior art devices using a polarized-beam splitter (Japanese Patent Publication No. 5-58899, Japanese Utility Model Publication No. 5-26561 and Japanese Laid-open Patent Publication No. 5-181135) use an expensive polarized-beam splitter and may split light into two linearly polarized beams: one beam having a polarization direction perpendicular to a plane including a light propagating direction
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