DIFFRACTIVE OPTICAL ELEMENT AND MANUFACTURING METHOD THEREOF

摘要

Disclosed is a diffractive optical element comprising a substrate (1) which is formed of a first optical material including a first resin and which is provided with a diffraction grating (2) on a surface of the substrate, an optical regulation layer (4) which is formed of a second optical material including a second resin and which is provided on the substrate (1)to cover the diffraction grating (2), and an intermediate layer (3) which is formed of a third optical material including a third resin and which is provided between the substrate (1) and the optical regulation layer (4).  The refractive index of the first optical material is smaller than the refractive index of the second optical material and the wavelength dispersion of refractive index of the first optical material is greater than the wavelength dispersion of refractive index of the second optical material.