| 摘要 |
A multilayer filter includes a dielectric multilayer film in which, layers of at least two types, each layer having a different refractive index, are stacked alternately, and a substrate on which, at least two stacks are stacked. A group delay dispersion of the stack decreases gradually as far from the substrate. The multilayer filter has an adjustment layer at any one or a more positions from positions, between the two stacks which are stacked, between the substrate and the stack, and on the stack which is farthest from the substrate. |
