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What is the polarisation of the emitted mode?

April 26, 2017emitted mode polarisation

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What is the polarisation of the emitted mode?

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The polarisation is vertical if the laser is laying horizontally, i.e the electrical field is perpendicular to the plane formed by the ceramic pads, see Axes of lasers. It is very pure as there is a quantum mechanical selection rule forbidding emission in the horizontal direction.