This is a typical lasing mechanism as in all lasers. The active region in a VCSEL laser is usually a quantum well structure. This slide shows the basic structure of a single quantum well. This structure can be repeated several times to construct a multiple quantum well.CSEL emits light in a cylindrical beam vertically from the surface of a fabricated wafer, and offers significant advantages when compared to the conventional edge-emitting lasers currently used in the majority of fiber optic communications devices.
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