Lasers are devices that concentrate beams of light by forcing their waveforms and frequencies to align.
The beating heart of lasers are materials that give parts of the electromagnetic spectrum a boost of energy as they pass through. This boost is referred to as 'stimulated emission
Stuck inside a cavity that bounces the light around, the gain medium technically amplifies the amount of light shining through it. This is the fundamental basis of light amplification by stimulated emission.
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