Uv-reflective interference layer system

Optical element comprising a transparent substrate with a layer system of reflective interference UV antireflection treatment broadband in the range of visible wavelengths, wherein the consecutive layers have different indices of refraction and the individual layers comprise materials stable to temperature and UV, characterized in that the layer system interference is exactly composed of five individual layers on the substrate with the following layer construction inorganic: substrate / M1 / ​​T1 / M2 / T2 / S, in which substrate designates the transparent substrate; M1, M2 a layer with average refractive index nm T1, T2 a layer with high refractive index nh S a layer with a refractive index lower Ns and a wavelength reference 550 nm, the refractive indices of the layers individual are in the following range: nn <1, 5 1, 6 <nm <1, 8 1, 9 <nh and the layer thickness of the individual layers is in elsiguiente range: for the layer M1: 70 nm <DM1 < 100 nm for the T1 layer: 30 nm <dT1 <70 nm for M2 layer: 20 nm <dM2 <40 nm for the T2 layer: 30 nm <dT2 <50 nm for the S layer: 90 nm <dS <110 nm