Definitions for "Stimulated Emission"
Keywords:  photon, lasing, excited, quantum, emit
process by which incident light of the proper frequency triggers emission of light (of the same frequency) by excited atoms
This occurs when photons in a semiconductor stimulate available excess charge carriers to the emission of photons. The emitted light is identical in wavelength and phase with the incident coherent light.
When an atom, ion or molecule capable of lasing is excited to a higher energy level by an electric charge or other means, it will spontaneously emit a photon as it decays to the normal ground state. If that photon passes near another atom of the same frequency, the second atom will be stimulated to emit a photon.