The stimulated emission of light
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What is a laser in general?
The answer begins with Albert Einstein who first defined the principle of stimulated emission in 1917. It states that an excited electron or molecule can deliver energy in the form of light. This stimulated emission is triggered by supplying energy to an ideally light amplifying material (the so-called laser-active material or medium) and thus bring it to a higher energy level (an energetically excited state). This energy supply is called ‘pumping’ in laser technology. When the excited electrons or molecules then fall back into their initial state, the previously absorbed energy will be delivered as a light beam. Today, the self-evidently used acronym LASER stands for exactly this phenomenon: Light Amplification by Stimulated Emission of Radiation.
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