POLARIZATION DIFFRACTION ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a compound polarization diffraction element with reduces optical loss and has slimmed phase delay by integrating a polarization diffraction element and a phase delay layer and successively laminating them on one substrate.SOLUTION: The element includes: the polarization diffraction element including a translucent substrate having a diffraction grating constructed by alternately formed concave parts and convex parts and a birefringent liquid crystal filled in the translucent substrate; and at least one phase delay layer formed by a material having birefringence and successively laminated on the liquid crystal of the polarization diffraction element.