I have been reading about how lasers function : A photon is used for stimulated emission of electrons from the metastable state to a lower energy state. What I don't understand is : How can "giving" energy (in the form of photons) to electrons stimulate them to come to a lower energy state ? After stimulated emission , the old photon exists along with the new one and with the same energy as earlier, so how did it actually stimulate the electrons to fall ?
PS : I have just begun to learn phy, so pls ans as simply as possible :)
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