ANTI-REFLECTIVE COATING FOR OPTICAL WINDOWS AND ELEMENTS

摘要

Generally, the invention is for a neutral color, anti-reflective coating for optical elements transmitting light in the visible range, said coating having a (3) layer or (4) layer structure comprising at least two coating materials selected from the group consisting of: (a) a coating material A having an index of refraction in the range of (1.35-1.5); (b) a coating material B having an index of refraction in the range of (1.9-2.4); and (c) a coating material C having an index of refraction in the range of (1.6 1.8.) wherein said coating is placed on the first face or the second face, or both, of a substrate transmissive to light in the visible range. The invention is further directed to optical elements having the foregoing coatings.