Abstract:
An optical element including a substrate that is transparent to light at a using wavelength band, an antireflection layer, a matching layer, and a birefringent layer formed of an oblique angle vapor deposition film, wherein an optical loss in the optical element at the using wavelength band is 1.0% or less, and the optical loss is calculated using the following formulae from intensity of transmitted light and intensity of reflected light measured by S-polarized light at an incident angle of 5° in the optical element, Transmittance=intensity of transmitted light/intensity of incident light (%) Reflectance=intensity of reflected light/intensity of incident light (%) Optical loss (%)=100%−transmittance (%)−reflectance (%).
Abstract:
This invention provides a polarization conversion element that is highly resistant to the heat and light that result from increased brightness levels. In said polarization conversion element, which is provided with a polarizing beam-splitter array in which polarizing beam splitters having polarization separation layers and reflecting prisms having reflective layers are bonded together in alternation, said polarizing beam splitters and reflecting prisms are bonded together by first adhesive layers each comprising a silicone adhesive.
Abstract:
This invention provides a polarization conversion element that is highly resistant to the heat and light that result from increased brightness levels. In said polarization conversion element, inorganic half-wave plates provided selectively on the output surface of a polarizing beam-splitter array have obliquely deposited layers comprising a dielectric material and the side surfaces of said obliquely deposited layers are covered by protective films.