| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polarization-independent optical isolator which includes a pair of wedge birefringent crystal plates and a Faraday rotator disposed between them and has improved assembly accuracy and workability. <P>SOLUTION: The polarization-independent optical isolator includes: a first holder 10 which has an inner body thereof divided into space parts 10a and 10b by a partition 12; and a second holder 9 which has an outer body thereof fitted into the space part 10b and has a space part 9a having one end closed by a bottom part 90 and having the other opened. A wedge birefringent crystal plate 3 is stored in the space part 10a of the first holder 10, and a wedge birefringent crystal plate 5 is stored in the space part 9a of the second holder 9, and a Faraday rotator 4 is fixed between the partition 12 and the bottom part 90. A notched concave portion 95 is provided at an open edge part of the second holder 9. A convex portion of a rotational adjustment external jig is engaged with the concave portion 95, and a rotational operation rod of the jig is caused to act to rotate the second holder 9 relative to the first holder 10, whereby wedge surfaces of the wedge birefringent crystal plate 3 and the wedge birefringent crystal plate 5 are arranged in parallel. Because of work using the rotational operation rod of the jig, fine adjustment at one degree or less is possible. <P>COPYRIGHT: (C)2013,JPO&INPIT |
