Description
Devices that are able to produce light through the optical amplification of the stimulated emission of electromagnetic radiation, such as gas lasers, solid-state lasers, fiber lasers, photonic lasers and semiconductor lasers. The spatial and temporal coherence of lasers allows for the concentration of light in one place, such as laser pointers, as well as the concentration of light in time, so that light can be produced in a much shorter time than other light and can also emit as single colour of light.