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Q. what is stimulated emission ??
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Stimulated emission is the effect that if a photon of energy Eph= h.v is incident to a particular that is an excited state, with a certain probability, the particle changes to a lower energy state by emission of a second photon of the same frequency, phase, direction & polarisation.
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Explanation:
Stimulated emission, in laser action, the release of energy from an excited atom by artificial means. According to Albert Einstein, when more atoms occupy a higher energy state than a lower one under normal temperature equilibrium (see population inversion), it is possible to force atoms to return to an unexcited state by stimulating them with the same energy as would be emitted naturally.
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