A laser is constructed from three principal parts: An energy source (usually referred to as the pump or pump source), A gain medium or laser medium, and Two or more mirrors that form an optical resonator. == Pump source == The pump source is the part that provides energy to the laser system.
A laser is constructed from three principal parts: An energy source (usually referred to as the pump or pump source), A gain medium or laser medium, and Two or more mirrors that form an optical resonator. == Pump source == The pump source is the part that provides energy to the laser system.
Source: Wikipedia "Laser construction" · CC BY-SA 4.0
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