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American Journal of Physics

Stimulated emission, absorption, and interference

Melissa Cray, Mei-Li Shih, Peter W. Milonni

Published Nov 1, 1982• 27 citations
Publisher

Abstract

It is shown how stimulated emission and absorption may be viewed in terms of the interference of the incoming field and the field radiated by the atom.
DOI
10.1119/1.12956

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An improved form of semiclassical radiation theory is developed which includes the effect of the atom's radiation field back on the atom. This formalism is applied to the problem of a single "two-level atom" interacting with a monochromatic field. The resulting equations are solved without resorting to time-dependent perturbation theory, and are found to predict the behavior of the system over times long compared with the lifetime for spontaneous transitions. Not only stimulated emission and absorption, but also spontaneous emission with the proper Einstein AAA coefficient, and a frequency shift which agrees at least semiquantitatively with the Lamb shift are described. In addition, several nonlinear effects involving the interference between spontaneous and stimulated radiation are described, and new experiments which might detect such effects are suggested.