Reflective polarized light separation and diffraction element and optical measurement device comprising same

A reflective polarized-light separating diffraction-element comprising:

• a substrate;
• and
• a lattice uneven structured body assembly that is formed on a surface of the substrate and exhibits a form birefringence,
• wherein
• an uneven surface of the lattice uneven structured body assembly is a reflection surface,
• the lattice uneven structured body assembly includes lattice uneven structured bodies of a plurality of patterns having lattice uneven structures of different azimuths,
• these lattice uneven structured bodies of a plurality of patterns are aligned on the surface of the substrate in a predetermined direction so that the azimuths of the lattice uneven structures change in a structurally periodic manner,
• the surface of the substrate is formed with stepped portions along the predetermined direction,
• each uneven lattice structured body including a pattern, of the plurality of patterns, is provided on a respective stepped portion, of the stepped portions, in accordance with the surface of the substrate, and
• the stepped portions are repeated in accordance with a structurally periodic change of the azimuth.