Volume hologram element and image display apparatus

Abstract

An object of the present invention is to provide a volume hologram element that is capable of diffracting light having different wavelengths and has less optical loss. Another object of the present invention is to provide an image display apparatus including a volume hologram element. A volume hologram element has a first main surface and a second main surface opposite to the first main surface, and has a thickness equal to or greater than 10 μm, the volume hologram element has a non-hologram region and a hologram region that surrounds the non-hologram region in an in-plane direction, a plurality of interference fringes each of which selectively diffracts light having a different wavelength are formed in the entire hologram region, and all of the plurality of interference fringes have no discontinuous portions in the hologram region.

Dependencies are inferred from the claim text.