A dielectric mirror is a special kind of a mirror, made of a substrate of glass or some other optical material, on which one or more thin layers of dielectric material are deposited, to form an optical coating.
A dielectric mirror is a special kind of a mirror, a one-dimensional geometry of photonic crystal. Dielectric mirrors are substrates made of glass (or sometimes other material) on which one or more thin layers of dielectric material are deposited, to form an optical coating.