Diffractive optical element used e.g. in the production of lenses has a surface made from an alkali and/or alkaline earth halide with a lattice structure or a structure similar to a lattice

摘要

Diffractive optical element has a surface made from an alkali and/or alkaline earth halide with a lattice structure or a structure similar to a lattice. An Independent claim is also included for a process for the production of the diffractive optical element. Preferred Features: The optical element comprises a support substrate with a surface coated with the alkali and/or alkaline earth halide. The structures are formed by removing the processed surface.