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Optically Pumped VECSELs: A Primer

Any semiconductor has a valence band and a conduction band, separated by a bandgap where electrons are forbidden.

In an electrically pumped semiconductor laser, a junction between dissimilar semiconductors is formed in which electrons and holes combine when a current passes through the device. An electron starts in the conduction band and a hole in the valence band, and a photon is created when they combine...

conduction band
A partially filled or empty energy band through which electrons can move easily. The material can therefore carry an electric current. The term is usually applied to semiconductors.
valence band
In a crystalline substance, the spectral range of states of energy that contains the crystal's binding valence electrons.
conduction bandsemiconductorvalence band

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