MULTIPLE LAYER REFLECTOR HAVING ALTERNATE HIGH AND LOW REFRACTIVE INDICES

摘要

A multilayer reflector of which the last layer most remote from the substrate and having a high refractive index is vapour-deposited from a mixture containing a metal or oxide of an element from group 4? of the periodic table and a metal oxide from the group beryllium oxide, magnesium oxide and calcium oxide, is particularly resistant to hydrogen and ultraviolet light and is hence suitable for application in a laser which is to have a long life.