Coherence and Two-Photon Absorption
P. Lambropoulos, Chihiro Kikuchi, R. K. Osborn · Physical Review · 1966
A kinetic theory of the two-photon absorption from a single mode of the radiation field is presented. It is found that, in general, the rate of two-photon absorption depends on certain correlation functions, and hence on the coherence properties, of the field. The results are applied to the case of a pure coherent state and the case of a chaotic field.