If the atom is in the excited state E2 and a photon of energy exactly equal to E2 – E1 = hυ is incident on
If the atom in the excited state automatically decays to the ground state by emitting a photon of energy (E2 – E1 = hυ), then
Stimulated Absorption is the starting point to achieve laser. It happens when a photon of light having energy E2 – E1 = hυ (as shown
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