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Stressed VCSEL Displays Stable Polarization

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Hank Hogan

When it comes to polarization, VCSELs, or vertical-cavity surface-emitting lasers, can't make up their minds. The devices are circular and symmetrical, but their constituent semiconductor materials have two crystal orientations, so the laser output polarizes along one of two directions. A group from Avalon Photonics Ltd. in Zurich, Switzerland, has found a way to stabilize polarization: Construct the VCSEL with T-shaped arms and put it under stress. The addition of T-shaped arms of width (d) to a vertical-cavity surface-emitting laser reduced the probability of polarization flipping. The...Read full article

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    Published: October 2002
    Research & TechnologyLasers

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