LASER is an acronym from "Light A mplification by Stimulated Emission of Radiation".
It is a device which radiates coherent light by excitation of molecules in a gas, or electrons in a solid, to a high energy stage and their release of this energy in the form of light after amplification by to and fro oscillations.
A laser beam has the following features.
|(3)||High energy density|
|(4)||Coherent in phase|
Examples of materials which are used to emit laser beam are as follows.
|Gas||:||He-Ne, Ar and CO2|
|Solid||:||YAG, Ruby and Glass|
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