These rugged multilayer antireflection coatings provide low level reflectance and excellent durability and adhesion for all substrate types. They find application in precision optical systems, telecommunications, optical fibers, missile systems and ophthalmic lenses. The coatings are produced with low temperature processes compatible with most types of glass and plastic. Deposited with ion- assistance, they have an extremely dense and compact film structure that exhibits superior moisture stability and durability. Standard designs are offered to cover most popular wavelength ranges; custom designs are available for any region from the UV to the far IR wavelengths.