| 摘要 |
A Faraday rotator of multilayer film type is provided which can achieve excellent optical characteristics with a reduced number of layers. In the Faraday rotator, a metal reflection film, a periodic dielectric multilayer film made of silicon dioxide SiO<SUB>2 </SUB>and tantalum pentoxide Ta<SUB>2</SUB>O<SUB>5</SUB>, a magneto-optical thin film, and another periodic dielectric multilayer film made of tantalum pentoxide Ta<SUB>2</SUB>O<SUB>5 </SUB>and silicon dioxide SiO<SUB>2 </SUB>is formed sequentially. Light incident on a polarizer goes therethrough, is reflected at the metal reflection film while traveling trough the periodic dielectric multilayer films, and goes through an analyzer to exit out.
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