LASER:-laser stands for light amplification by stimulation emission of radiation.....
When an electron is excited from a lower to a higher energy level, it will not stay that way forever. An electron in an excited state may decay to a lower energy state which is not occupied, according to a particular time constant characterizing that transition. When such an electron decays without external influence, emitting a photon, that is called "spontaneous emission"
but
laser basically works on stimulated emission.....
When an electron is excited from a lower to a higher energy level, it will not stay that way forever. An electron in an excited state may decay to a lower energy state which is not occupied, according to a particular time constant characterizing that transition. When such an electron decays without external influence, emitting a photon, that is called "spontaneous emission"
but
laser basically works on stimulated emission.....
Stimulated emission:-
A transition from the higher to a lower energy state, however, produces an additional photon; this is the process of stimulated emission.
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