Method for producing an optical device, optical device, image display apparatus, and head-mounted display

A method for producing an optical device, comprising:

• a bonding step of bonding a hologram photosensitive material on a transparent base member;
• and
• an exposing step of exposing the hologram photosensitive material to laser light of a plurality of different wavelengths from a fabrication light source in order to form on the transparent base member a hologram optical element having diffraction efficiency peaks at a plurality of diffraction peak wavelengths corresponding to the plurality of different wavelengths,
• wherein the exposing step includes a step of adjusting exposure amounts of laser light of the different wavelengths from the fabrication light source in such a way that, when a plurality of illumination light sources corresponding to the individual diffraction peak wavelengths are used as a reproduction light source during reproduction, diffraction efficiency at the diffraction peak wavelength corresponding to, of the plurality of illumination light sources, the illumination light source that consumes least electric power when fed with a given amount of current is lower than diffraction efficiency at the other diffraction peak wavelengths.