 97442 King C., Waxler R.
 Stimulated particle emission  a simple example.
(67K, Plain TEX)
Aug 11, 97

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Abstract. We find evidence of stimulated photon emission
in a simple model of the atom plus radiation
system, namely a two state atom interacting with a quantised
scalar field in the rotating wave approximation.
We use an initial state where the atom is excited and
there is one photon present, and the photon energy is
close to the energy difference between the two atomic states.
By taking the longtime, weakcoupling limit, we compute in closed
form the probability that the atom remains in its excited state
as a function of the rescaled time. Our results indicate that
stimulated emission does occur for certain initial photon states,
but only at quadratic order in the rescaled time.
We also find partial recurrence of the excited state.
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