| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical isolator optical element having a mark that does not serve as an obstructive element for downsizing.SOLUTION: The optical isolator optical element is composed of a laminate structure 10 including one Faraday rotator 13 attached between two polarizers 11, 12, and incorporated in an optical isolator so that the polarizer 11 positioned on one end of the laminate structure in a lamination direction composes an incidence surface and the polarizer 12 positioned on the other end composes an emission surface. The optical isolator optical element is further incorporated so that the laminate structure has a rectangular parallelepiped shape formed by the cross sectional quadrangular Faraday rotator and the polarizer and so that the incidence surface and the emission surface of the laminate structure are parallel to a plane perpendicular to an optical axis. When the optical isolator optical element is incorporated, cut marks 14 for indicating the polarizer serving as incidence surface are continuously provided over a ridge part of the laminate structure formed by connecting respective corner parts of the Faraday rotator and the polarizer in the lamination direction. |
