Investigation of the possibility of creation of broadband reflective coating on metallic basis

By electron beam evaporation in vacuum, metal coatings of aluminum, silver, gold, nickel, chromium, palladium were deposited on the surface of a substrate of K8 optical glass. The best optical characteristics for creating a broadband mirror coating are aluminum films. To study the effect of dielectric films on the reflection coefficient of a specular coating, experiments were carried out to apply quartz and zirconium oxide films to the surface of the base aluminum mirror. The creation of a broadband mirror coating exclusively from dielectric materials leads to a significant increase in the reflection coefficient, but in a narrow spectral region with a decrease in the reflection coefficient over the remaining optical part of the spectrum. (authors)