| 摘要 |
In the present invention, a Faraday rotator includes: a Faraday element (31) formed from a magneto-optic material (34); two permanent magnets (35); and an electromagnet (20a). With the front-rear direction as the direction in which light advances, the Faraday element has a light entry/exit surface on both the front and rear thereof, and has mutually parallel surfaces on the left and right thereof. The permanent magnets have a flat plate shape, and are attached to the left and right side surfaces of the Faraday element such that the mutually different magnetic poles of the permanent magnets face each other and impart a permanent magnetic field to the Faraday element in the right-left direction. Also included is a shaft part (10) that holds the Faraday element, to which the permanent magnets are attached, across the entire length of the Faraday element in the front-rear direction. The electromagnet has a coil formed by winding a conductor wire (21) around the shaft part with the front-rear direction as the axis, and imparts a front-rear direction variable magnetic field to the Faraday element. |
