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From wiki:
The rate of spontaneous emission depends partly on the environment of a light source. This means that by placing the light source in a special environment, the rate of spontaneous emission can be modified. In the 1950s E. Purcell discovered the enhancement of spontaneous emission rates of atoms when they are matched in a resonant cavity (the Purcell Effect)

E. M. Purcell, Phys. Rev. 69, 681 (1946)
http://en.wikipedia.org/wiki/Spo ... ion:_Purcell_Effect
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