| 摘要 |
PROBLEM TO BE SOLVED: To provide a broadband polarized light separating element having a good extinction ratio (polarized light separating degree) to >=2 plural wavelengths. SOLUTION: The broadband polarized light separating element 1 of a grating type which separates the orthogonal polarized light of incident light to zero order light and diffracted light by periodic grids alternately arranged with double refractive regions (double refractive films) 3 and isotropic regions (isotropic over-coating layers) 4 is constituted to have the function to separate light of at least two wavelengths λ1 , λ2 varying from each other. As a result, the broadband polarized light separating element capable of separating the light of the two different wavelengths λ1 , λ2 to the zero order light and the diffracted light may be embodied. |
