Optical element with a stack of layer packets, and method for producing the optical element

The invention relates to an optical element (100) comprising a substrate (20) and an interferometrically reflection-reducing layer system (10) on at least one surface (22) of the substrate (20), wherein the layer system (10) comprises a stack (40) of at least four successive layer packages (42, 44, 46, 48), wherein each layer package (42, 44, 46, 48) comprises a first partial layer (60) with a first optical thickness (t1) and a second partial layer (62) with a second, comprises an optical thickness (t2) different from the first optical thickness (t1), wherein a refractive index (n1) of the respective first partial layer (60) closer to the substrate is greater than a refractive index (n2) of the respective second partial layer (62) of the stack (40) further away from the substrate, wherein the layer system (10) has a brightness (L*), a chroma (C*) and a hue angle (h) of a residual reflection color, wherein the hue angle (h) changes by a maximum of 15° in an interval of a viewing angle (AOI) with the limit values 0° and 30° relative to a surface normal (70) to the layer system (10). The invention also relates to a method for designing an optical element.