G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/09 (2006.01) H01F 10/24 (2006.01) H01F 10/32 (2006.01)
Patent
CA 2311436
There is provided a Faraday rotation angle varying device in which external magnetic fields are applied from at lease two directions to a garnet single crystal having a Faraday effect and vary a synthesized magnetic field so that Faraday rotation angle of light which transmits through the garnet single crystal is controlled. The device has a base film of garnet single crystal having a rotation angle varied in accordance with variation of a synthesized magnetic field, and a compensating film of a garnet single crystal having a constant Faraday rotation angle. The base film has a wavelength coefficient sign and the compensating film has a wavelength coefficient sign which is different from that of the base film, so that a wavelength variation component of the Faraday rotation angle of the base film is reduced by the compensating film. For example, a fixed magnetic field parallel to a light direction is applied by permanent magnets and a variable magnetic field is applied by an electromagnet.
Voici un dispositif de changement d'angle d'effet Faraday dans lequel des champs magnétiques externes sont appliqués depuis au moins deux directions à un cristal de grenat unique ayant un effet Faraday, et où varie un champ magnétique synthétique de sorte que l'angle d'effet Faraday de la lumière qui émet à travers le cristal de grenat unique est contrôlé. Le dispositif possède un film de base de cristal de grenat unique dont l'angle de rotation varie conformément à la variation d'un champ magnétique synthétique, et un film de compensation de cristal de grenat unique ayant un angle d'effet Faraday constant. Le film de base a un signe de coefficient de longueur d'onde et le film de compensation a un signe de coefficient de longueur d'onde qui est différent de celui du film de base, de sorte qu'un élément de variation de longueur d'onde de l'angle d'effet Faraday est réduit par le film de compensation. Par exemple, un champ magnétique fixe parallèle à la direction d'une lumière est appliqué par des aimants permanents et un champ magnétique variable est appliqué par un électroaimant.
Kawai Hirotaka
Umezawa Hiromitsu
Fdk Corporation
Marks & Clerk
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