Abstract: The present invention relates to a transparent substrate with a multilayer film including: a transparent substrate having two main surfaces; and a multilayer film obtained by laminating at least two or more layers having refractive indices different from each other, and disposed on or above at least one main surface of the transparent substrate, in which the multilayer film includes one or more silicon oxide layers, and at least one layer of the one or more silicon oxide layers has a refractive index of 1.460?n<1.478 at a wavelength of 550 nm.

Abstract: An anti-reflective laminate includes: a substrate; and an anti-reflective layer having a four-layer structure including a first refractive index layer, a second refractive index layer, a third refractive index layer, and a fourth refractive index layer. The first refractive index layer has a refractive index of 1.25 to 1.50, the second refractive index layer has a refractive index of 1.50 to 2.40, the third refractive index layer has a refractive index of 2.25 to 2.45, and the fourth refractive index layer has a refractive index of 1.25 to 1.50. The first refractive index layer has a thickness of 40 to 105 nm, the second refractive index layer has a thickness of 60 to 90 nm, the third refractive index layer has a thickness of 80 to 110 nm, and the fourth refractive index layer has a thickness of 70 to 100 nm.

Abstract: An optical filter includes: a substrate; a dielectric multilayer film laid on or above at least one major surface of the substrate; and a protective layer laid on or above the dielectric multilayer film, in which the dielectric multilayer film includes a layer made of amorphous silicon and a layer differing in refractive index from the layer made of amorphous silicon, the protective layer includes a mixed film, and the mixed film includes silica, and an oxide of at least one metal selected from among tantalum, niobium, zirconium, titanium, hafnium, tungsten, tin, cerium, chromium, nickel, and vanadium.

Abstract: The present invention relates to a transparent substrate with a multilayer film including: a transparent substrate having two main surfaces; and a multilayer film obtained by laminating at least two or more layers having refractive indices different from each other, and disposed on or above at least one main surface of the transparent substrate, in which the multilayer film includes one or more silicon oxide layers, and at least one layer of the one or more silicon oxide layers has a refractive index of 1.460?n<1.478 at a wavelength of 550 nm.