go Absorption, Spontaneous & Stimulated Emission process explained along with the basic concepts of Transition Probabilities in all in terms of density of radiation and Einstein Coefficients. Useful to clear understanding about the 3 different processes of LASER. As you know the absorption – emissions are two important process in laser action, where emission is divided in two categories one is spontaneous emission while the other is stimulated emission.
Absorption – Emissions
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