G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/09 (2006.01)
Patent
CA 2324929
An optical isolator comprises an optical element assembly (10) including a Faraday rotator (1) and a pair of polarizing elements (2) one of which is arranged on a light-input side of the Faraday rotator (1) to serve as a polarizer and other of which is arranged on a light-output side to serve as an analyzer. The optical element assembly (10) is received at the center of an inner bore or a cavity of a cylindrical iron-chromium-cobalt (Fe-Cr-Co) magnet (5). The Faraday rotator (1) comprises a magnetic garnet thick film which is a Bi garnet thick film remarkably low in saturation magnetization as compared with a rare-earth garnet. The Fe-Cr-Co magnet (5) serves as a field- application magnet for generating a magnetic field applied to magnetize the Bi garnet thick film and also as an isolator casing because it is excellent in magnetic and mechanical characteristics.
L'invention concerne un isolateur optique comprenant un ensemble d'éléments optiques (10) qui inclut un rotateur de Faraday (1) et une paire d'éléments polarisants (2) dont l'un est agencé du côté d'une entrée de lumière du rotateur de Faraday (1) afin de servir de filtre de polarisation, et l'autre est agencé du côté d'une sortie de lumière afin de servir d'analyseur. L'ensemble d'éléments optiques (10) prend place au centre d'un alésage intérieur ou de la cavité d'un aimant cylindrique cobalt-chrome-fer (Fe-Cr-Co). Le rotateur de Faraday (1) comprend un film épais magnétique en grenat qui est un film épais de grenat au bismuth dont la magnétisation de saturation est remarquablement basse comparée à celle d'un grenat aux terres rares. L'aimant Fe-Cr-Co (5) sert d'aimant applicateur de champ permettant de générer un champ magnétique appliqué pour magnétiser le film épais de grenat au bismuth, et il sert également d'enveloppe d'isolateur car ses caractéristiques magnétiques et mécaniques sont excellentes.
Kimura Masayuki
Nakajima Takahiro
Satoh Tadakuni
Dennison Associates
Nec Tokin Corporation
Tokin Corporation
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