LIGHT SPLITTING INTERFERENCE COATING Russian patent published in 1997 - IPC

FIELD: optical instrumentation engineering. SUBSTANCE: light splitting interference coatings is designated POKrB, where P is substrate made of zinc selenide; O is clarifying coating; KrB is external layer with high refractive index and variable thickness determined by Krlaw of thickness variation depending on radial coordinate. Thickness of external layer KrB does not exceed λ/4, where λ- is working wave length. Clarifying coating is construction of BH type, where B is quarter-wave layer of germanium telluride; H is quarter-wave layer of film forming material with refractive index n=2.2-2.7. External layer of variable thickness is made of germanium telluride. EFFECT: enhanced manufacturing process. 2 cl 4 dwg