| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength selective optical filter which is improved to sufficiently reduce incident angle dependency and thereby, contributes to simplification of configurations of various devices as objects for assembling.SOLUTION: The wavelength selective optical filter comprises a laminate 12a disposed on at least one surface of a transparent substrate 11, the laminate having such a configuration that a plurality of low refractive index layers L showing a relatively low refractive index and a plurality of high refractive index layers H showing a relatively high refractive index are alternately laminated. The laminate 12a includes: a first laminate structure 21 in which low refractive index layers and high refractive index layers each having an optical film thickness twice or more the optical film thickness of the low refractive index layer are alternately laminated; and a second laminate structure 22 in which high refractive index layers and low refractive index layers each having an optical film thickness twice or more the optical film thickness of the high refractive index layer are alternately laminated. |
