| 摘要 |
PURPOSE:To enable a plane of polarization to be rotated tunably in an arbitrary direction and to expand an application range by using an electromagnet which shows superconduction under a specific condition as a magnetic field generation source, and increasing magnetic strength. CONSTITUTION:As the magnetic field generation source, superconductive solenoids 5 and 5' made of a YBaCuO group superconductive material which shows a superconductive property at the critical temperature of around that of liquid nitrogen is used. By rotating the plane of polarization, linear polarization is made incident on a Faraday rotational material 4 from a window 3 provided at a heat insulating vessel 2, and is emitted via a window 6. Also, the rotational material 4 is arranged within the magnetic field of the solenoids 5 and 5'. And they are cooled by the liquid nitrogen 7 filled in the heat insulating vessel 2, thereby, the superconductive property can be maintained. Bycontrolling an excitation current 9 to be supplied from a power source 8 to the solenoids 5 and 5', the angle of rotation of the plane of polarization is changed. In such a way, it is possible to rotate the plane of polarization tunably and successively in the arbitrary direction. |
