| 摘要 |
In a semiconductor laser module with a built-in optical isolator which isolator consists of a polarizer, a Faraday rotator and an analyzer, an optical refraction sheet having a wedge-shaped section is disposed on the beam incidence side of the polarizer. Accordingly, even when the mechanical center axis of the optical isolator is placed to be in parallel with the optical axis of the semiconductor laser or in other words, even when the beam incidence-outgoing surfaces of the polarizer, Faraday rotator and analyzer are placed to be vertical to the incident parallel beams, the parallel beams incident into the optical isolator are refracted by the optical refraction sheet having the wedge-shaped section, so that the parallel beams passing through the beam incidience-outgoing surfaces of the polarizer, Faraday rotator and analyzer do not pass vertically and the return of reflected beams to the semiconductor laser can be thus reduced.
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