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US 6,785,037 B2Granted
Faraday rotator
AssigneeMinebea Co., Ltd.
InventorsTakeshi Matsushita, Mitsuteru Inoue, Hideki Kato, Akio Takayama
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AssigneeMinebea Co., Ltd.
InventorsTakeshi Matsushita, Mitsuteru Inoue, Hideki Kato, Akio Takayama
Estimating the term…
A Faraday rotator of multilayer film type is provided in which satisfactory optical characteristics are obtained with a small number of layers. In the Faraday rotator, a first periodic dielectric multilayer film made of silicon dioxide SiO2 and tantalum pentaoxide Ta2O5 is formed on a substrate, then a magneto-optical thin film, and a second periodic dielectric multilayer film made of tantalum pentaoxide Ta2O5 and silicon dioxide SiO2 are formed sequentially. The first and second periodic dielectric multilayer films sandwich the magneto-optical thin film such that their respective higher refractive dielectric thin films are in contact with the magneto-optical thin film. The number of layers of the first periodic dielectric multilayer film is larger than that of the second periodic dielectric multilayer film.
A Faraday rotator including a laminate film comprising a first periodic dielectric multilayer film in which two kinds of dielectric thin films having refractive indexes different from each other are alternately laminated with regularity in each thickness thereof, a second periodic dielectric multilayer film in which two kinds of dielectric thin films having refractive indexes different from each other are alternately laminated with regularity in each thickness thereof, and a magneto-optical thin film which is sandwiched between the first and second periodic dielectric multilayer films, wherein a number of layers of the first periodic dielectric multilayer film is different from that of the second periodic dielectric multilayer film.
A Faraday rotator including a laminate film comprising a first periodic dielectric multilayer film in which two kinds of dielectric thin films having refractive indexes different from each other are alternately laminated with regularity in each thickness thereof, a second periodic dielectric multilayer film in which two kinds of dielectric thin films having refractive indexes different from each other are alternately laminated with regularity in each thickness thereof, and a magneto-optical thin film which is sandwiched between the first and second periodic dielectric multilayer films, wherein the first and second periodic dielectric multilayer films are each structured such that one dielectric thin film having a higher refractive index of the two kinds is in contact with the magneto-optical thin film, wherein a number of layers of the first periodic dielectric multilayer film is larger than that of the second periodic dielectric multilayer film, and wherein a dielectric thin film with a high refractive index is additionally provided between the laminate film and a substrate on which the laminate film is formed.
Dependencies are inferred from the claim text.