The design of a highly reflective interference coating with the ability to control the laser induced damage threshold is calculated. The coating consists of twenty-five quarter-wave layers formed of silicon nitride and silicon dioxide with a sublayer of silver on an optical element made of quartz glass grade KU-1. One of the layers which was formed from silicon nitride has a half-wave thickness to obtain a structure like a Fabry-Perot interferometer. A relationship is established between the structure of the interference coating and the magnitude of the electric field strength in the layers when exposed to laser radiation. The introduction of a sublayer made of silver deposed on a substrate into the construction of a dielectric multilayer coating allows one to obtain a reflection coefficient at a control wavelength of greater than 99%. In this case, the fraction of laser radiation incident on the silver sublayer is less than 0.5%.
This research considers the influence of the structure of an interference reflective filter, structure of which includes interference layers made of non-absorbing dielectric materials, on the stability of its spectral characteristics with a change in the angle of incidence. A reflective filter is formed from the layers of equal or multiple optical thickness made of two film-forming materials. Our research has shown that with reducing difference between refractive indices of the filmforming materials, the bandwidth of stop-band decreases. The FWHM of stop-band of the filter is determined by the refractive indices of the film-forming materials. The dependence of stop-band shift on the wavelength scale with a change in the angle of incidence on the multilayers of dielectric structure has been established. The obtained function allows to impose restrictions on the film-forming materials to ensure a minimum shift of the spectral characteristic in a wide range of the angle of incidence.
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