An instrument with three wavelengths for measuring the extinction ratio of laser crystal is described.

介绍一种三波长的激光晶体消光比测试仪。

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A structure of the switch is given, which has an ideal extinction ratio and is characterized by its easy alignment and no strict confinement of the length along Z-axis.

介绍了这类开关的一种结构，它有理想的消光比，并具有校准方便，对沿Z轴长度无严格限制等特点。

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