The laser is a device that emit light process optical amplification based on the stimulated emission of electromagnetic radiation. The term “laser” is an acronym for “light amplification by stimulated emission of radiation”.
A laser is produced when electrons in atoms, in special glasses, crystals, or gases absorb energy of an electric current or another laser and become “excited”. Than the excited electron jumps from lower energy orbit to higher energy orbit around the nucleus of an atom. When the electrons return to their normal state, they emit photons (particles of light).
All photons on the same wavelength and “coherent”, which means that the crests and troughs of the light wave in the leg. In contrast, ordinary visible light consists of many waves and is not intelligible.
Stimulated emission of light was a discovery by albert Einstein around 1916.
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