| http://www.w3.org/ns/prov#value | - The invention concerns a method of producing optical elements, in particular filters, with interference layers comprising alternately slightly refractive and highly refractive dielectric layers deposited on a substrate S. The first layer 1 applied to the substrate is Al2 O3, constituting a slightly refractive layer, after which further layers 2 to n of ZnS and Al2 O3 are applied in an alternating
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