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  1. Laser

    Linked via "pump source"

    Pumping Mechanisms
    The energy input required to achieve population inversion is called the pump source. The mechanism of pumping depends entirely on the state of the gain medium:
    Optical Pumping: Used typically for solid-state and gas lasers (e.g., Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG)/) or Ruby lasers). …