Lasers are devices that produce a narrow, intense beam of coherent light through the process of stimulated emission.
The process in which an incoming photon triggers the release of additional photons with the same frequency and phase.
Coherent Light: Light waves that have the same frequency and are in phase with each other, resulting in constructive interference.
Optical Resonator: A cavity or structure within a laser that reflects light back and forth to amplify it before it is emitted as a laser beam.