| 摘要 |
PURPOSE: An optical isolator in semiconductor laser modules can be placed on planar surface by an open core magnet. CONSTITUTION: An optical isolator(1) comprises an isolator element(4) and a magnet(2) having a rectangle orifice(3) to which the isolator element(4) is placed. The isolator element comprises a Faraday rotator(6), at least one polariser(7a,7b) and an optical axis which passes through the orifice(3) in the magnet(2). The magnet(2) is an open core magnet shaped so that when placed on a substantially planar surface an orifice(3) is decided by the magnet(2) and the substantially planar surface.
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