Optical properties of multilayer overcoated aluminum films in the uv (2000-2500 A).

Optical properties of high reflectance, low absorptance coatings consisting of aluminum films overcoated with multilayers of Al(2)O(3) and MgF(2) are reported in the far ultraviolet. Coating design considerations and preparation techniques are described and the potential of such reflectors for multiple-beam interferometry is considered. Transmission characteristics of experimental Fabry-Perot type interference filters constructed from these Al-multilayer coatings are discussed.