Multilayer antireflective coating with a graded base layer

The invention claims a anti-reflective protective layer, the coating comprising a composed of the total thickness of bead welding layer the released, and ratio of the refraction index of the gradient layer and substrate interface of with the low refraction index of the substrate's refraction index probably matched to the substrate interface are ratio level surface processing high refraction index a first layer and second, the second group is chosen to the wherein refraction index is equal to the height of the gradient r.i and second and gradient interface areSecond surface processing incident medium refraction index product the root. The thickness of the reflecting layer at least one for designing wavelength of selecting one-fourth.