| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a ring type Faraday rotation device wherein response characteristics for switching polarization surfaces are improved and a magnetic yoke can be miniaturized and which can be easily controlled. <P>SOLUTION: The ring type Faraday rotation device is provided with the substantially ring type magnetic yoke 10 consisting of a high magnetic permeability material, a plurality of coils 12 wound on the magnetic yoke and a magneto-optical element 14 positioned in a nearly center part of the magnetic yoke. A coil current is controlled so that the direction of a magnetic flux passing through one side half of the magnetic yoke and the direction of a magnetic flux passing through the other half are always reverse to each other and a synthesized magnetic field thereof is made to pass through the magneto-optical element. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
