Interference Filters
Interference filters and interference mirrors are optical components. They use the effect of interference to filter or reflect light depending on its wavelength. With regard to the visible spectrum, the light can be filtered depending on the color. Interference filters are constructed using a large number of thin, transparent individual layers with alternating high and low refractive indexes. In this process, thin, dielectric layers are applied to a substrate. The thin films are produced by means of coating technologies such as vacuum coating, whereby various technologies are available. Such coating systems can be used to implement applications for reflection reduction (reflection reduction / anti-reflective coatings AR), but also for reflection enhancement (mirrors / highly reflective systems HR) and filter elements. The aim of the filter design is to achieve a high degree of transmittance (close to 100%) in the passband and at the same time the highest possible degree of suppression (close to 0% transmission) in the restricted area. The designation of a component as a filter or mirror depends on whether the transmitted or the reflected light is used.
