Vv. Dodonov et Ss. Mizrahi, STATIONARY STATED IN SATURATED 2-PHOTON PROCESSES AND GENERATION OF PHASE-AVERAGED MIXTURES OF EVEN AND ODD QUANTUM STATES, Acta physica slovaca, 48(3), 1998, pp. 349-360
We consider a relaxation of a single mode of the quantized field in a
presence of one- and two-photon absorption and emission processes. Exa
ct stationary solutions of the master equation for the diagonal elemen
ts of the density matrix in the Fock basis are found in the case of co
mpletely saturated two-photon emission. If two-photon processes domina
te over single-photon ones, the stationary state is a mixture of phase
averaged even and odd coherent states.