Abstract
The Heisenberg operator formalism is used here to determine the equations governing the intensity of scattered radiation resulting from partially coherent radiation incident on discrete scatterers. Using an iteration procedure a generalization of the Kramers-Heisenberg relation is derived. It is shown how this relation may be used in measuring the two-point coherence of the incident radiation for incident fields with a wide angular spectrum. In the course of the derivation of the fourth-order equation we mention the effects of partial coherence on the second-order absorption and stimulated-emission processes. We also point out in the third-order iteration how the absorption process for incident radiation composed of two distinct frequency bands depends upon the coherence between the bands.
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