| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical isolator having a sufficient aperture diameter and magnetic field intensity and a small outside diameter. SOLUTION: This optical isolator is formed by superposing a first magnet 2 bored in a light transmission direction, a first polarizer 5, a Faraday rotator 6, a second polarizer 7 and a second magnet 4 bored in a light transmission direction in this order. The first polarizer 5, the Faraday rotator 6 and the second polarizer 7 are housed in a ring 3. On the other hand, the outside diameters of the first magnet 2 and the second magnet 4 are made the same as the outside diameter of the ring 3 in the optical isolator.
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