- 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.
MORE FROM PHOTONICS MEDIA