| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sheet-like polarizing element which has high light utilization efficiency and is free from the thermal deterioration of polarization characteristics by the absorption heat generation of a light source by converting the randomly polarized light to the polarized light of only the one direction without light absorption in the polarizing element which takes only the polarized light of the one direction out of the randomly polarized light without utilizing light absorption dichromaticity as with conventional polarizing plates. SOLUTION: Multilayered dielectric films 40 alternately laminated with high- refractive index layers/low-refractive index layers are arranged between the slopes of the respective prisms in such a manner that these films attain nearly a Brewster angle with an incident light source in the prisms which are alternately superposed on each other and are continuously worked to a right-angled triangular shape and vary in refractive indices. The randomly polarized light which is made incident is separated to P polarized light and S polarized light and thereafter, only the S polarized light of the reflected light is converted to the P polarized light via a halfwave plate 50 arranged on the respective prism faces parallel with the incident light. The transmitted P polarized light and the converted P polarized light are respectively taken out, by which the taking out of the linearly polarized light polarized to the one direction out of the randomly polarized light without the light loss is made possible. |
