Broadening and saturation in n-photon absorption
L. Allen and C. R. Stroud, Jr.
Phys. Reports 91, 1 (1982).
A theory is developed which treats in a unified way the many different
aspects of the problems of the resonant excitation of a high-lying atomic
or molecular state by the absorption of n photons from up to n different
lasers. It is assumed that no intermediate states are resonantly excited.
The effects of saturation, Stark shifts, spontaneous emission, and finite
laser bandwidths are included. In the general case the formalism reduces
to a set of equations analogous to the Bloch equations. In special
circumstances the formalism reduces further to rate equations or to simple
single or double integrals: in these cases Doppler broadening is included
as well. The domains in which each of the formalisms is appropriate are
carefully defined and various asymptotic cases presented.
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