On the exactly soluble model in quantum electrodynamics
Nikolay N. Bogolubov, Fam Le Kien, A.S. Shumovsky · Journal of Physics A Mathematical and General · 1986
The model of a ladder configuration three-level atom interacting with a two-mode near-resonant radiation field is treated. It is shown that the operator equations of motion can be solved explicitly. The dynamical behaviour of the photon numbers and level populations is studied for various initial conditions.