DIFFRACTION OPTICAL ELEMENT AND MANUFACTURING METHOD THEREFOR

摘要

A diffraction optical element disclosed in the present application is provided with: a substrate produced from a first optical material containing a first resin and having a diffraction grating on the surface thereof; and an optical adjustment layer produced from a second optical material containing a second resin and inorganic particles and provided on the substrate so as to cover the diffraction grating. ∆SP defined by the following equation is -0.7-+0.7 [cal/cm3]1/2 inclusive, the design order of diffraction by the diffraction grating is an n-th order, and n+1-th order unnecessary order diffracted light in the wavelength region of 400-700 nm inclusive is 7% or less. ∆SP = [solubility parameter of the second resin]-[solubility parameter of the first resin]