Abstract
The design and manufacture of a cut-on optical filter for the 8–11.7 μm region, fully blocked to uv, is described. The filter is composed of PbTe/ZnS symmetrical stacks deposited on two sides of a germanium substrate. Binder layers of Y 2O 3 between the multilayers and the substrate markedly improved the coating's environmental durability. A total of 30 layers was deposited and the average transmittance was 95% in the desired region.
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