Abstract

Subject of study. This study investigated a mirror coating composed of aluminum and copper alloy on the surface of a substrate with a lutetium oxide protective coating on top of the reflective layer. Aim of study. The application of a mirror coating composed of aluminum and copper alloy and its protection with lutetium oxide was examined. The structure of the optical mirror coating enables an increased reflection coefficient in all operating spectral ranges. Method. A mirror coating made of aluminum and copper alloy with a lutetium oxide protective layer was applied to a substrate of an optical material using vacuum deposition by the VU-1A setup. The thicknesses of the layers were controlled during deposition using a quartz control system. Main results. The optimum percentage ratio of materials in the aluminum and copper alloy for the reflective coating layer deposition and the thicknesses ratio of the adhesive, reflective, and protective layers were determined. The possibility of using lutetium oxide as a protective layer was established. Practical significance. The obtained results enable the development of reflective coatings for optical mirrors with high reflection coefficients for use in various modern optical and optoelectronic devices and in systems operating in different spectral ranges.

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