Semiconductor laser

Semiconductor laser is a laser system that causes laser oscillation by flowing an electric current to semiconductor.

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In semiconductor laser theory , the optical gain is produced in a semiconductor material. The choice of material depends on the desired wavelength and properties such as modulation speed. It may be a bulk semiconductor, but more often a quantum heterostructure.

Semiconductor lasers are lasers based on semiconductor gain media, where optical gain is usually achieved by stimulated emission at an interband transition under conditions of a high carrier density in the conduction band.