3 and 4 Level Systems in Lasers - A Level Physics
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3 and 4 Level Systems in Lasers - A Level Physics
This video explains 3 level systems and 4 level systems in lasers for A Level Physics. In reality a three or four level energy system is used to allow a population inversion, with the atoms excited by pumping them with an external source of energy. In both a three level system and a four level system, we have a metastable energy level where ...
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