| 摘要 |
The present invention solves problems such as ghosts produced by dihedral reflection, with little dependence on polarized waves with respect to inclined incidence. An optical multilayered film bandpass filter is provided with: a transparent substrate facing target light; an LWPF unit which is formed on only one side of the substrate, and forms a rising section on the short wavelength side in the bandpass characteristics and a reflection band; an SWPF unit which forms a falling section on the long wavelength side in the bandpass characteristics and the reflection band; and a polarized-wave dependency improvement unit for controlling the separation of P waves and S waves produced by the inclined incidence of the target light in the rising section and the falling section respectively formed by the LWPF unit and the SWPF unit. The LWPF unit, the SWPF unit, and the polarized-wave dependency improvement unit are provided with a structure comprising a plurality of alternately laminated layers of high refractive index layers formed by a first dielectric body, and low refractive index layers formed by a second dielectric body having a lower refractive index than the first dielectric body. |
