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US 6,480,636 B1Granted
Optical isolator comprising a faraday rotator
AssigneeTokin Corporation
InventorsTadakuni Satoh, Masayuki Kimura, Takahiro Nakajima
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AssigneeTokin Corporation
InventorsTadakuni Satoh, Masayuki Kimura, Takahiro Nakajima
Estimating the term…
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.
An optical isolator including a Faraday rotator of a magnetic garnet thick film and a field-application magnet for generating a magnetic field applied to magnetize said magnetic garnet thick film, wherein said field-application magnet is selected from the group consisting of an iron-chromium-cobalt (Fe—Cr—Co) magnet, a Cunife magnet made of a copper-nickel-iron (Cu—Ni—Fe) alloy, a platinum (Pt) alloy magnet made of a Pt—Co alloy or a Pt—Fe alloy, and a Cunico magnet made of a copper-nickel-cobalt (Cu—Ni—Co) alloy,
An optical isolator including a Faraday rotator of a magnetic garnet thick film and a field-application magnet for generating a magnetic field applied to magnetize said magnetic garnet thick film, wherein said field-application magnet is selected from the group consisting of an iron-chromium-cobalt (Fe—Cr—Co) magnet, a Cunife magnet made of a copper-nickel-iron (Cu—Ni—Fe) alloy, a platinum (Pt) alloy magnet made of a Pt—Co alloy or a Pt—Fe alloy, and a Cunico magnet made of a copper-nickel-cobalt (Cu—Ni—Co) alloy,
An optical isolator including a Faraday rotator of a magnetic garnet thick film and a field-application magnet for generating a magnetic field applied to magnetize said magnetic garnet thick film, wherein said field-application magnet is selected from the group consisting of an iron-chromium-cobalt (Fe—Cr—Co) magnet, a Cunife magnet made of a copper-nickel-iron (Cu—Ni—Fe) alloy, a platinum (Pt) alloy magnet made of a Pt—Co alloy or a Pt—Fe alloy, and a Cunico magnet made of a copper-nickel-cobalt (Cu—Ni—Co) alloy,
Dependencies are inferred from the claim text.