Abstract
A kinetic equation for the photon density matrix of a monomode laser model with explicit heat baths is derived in the framework of the Prigogine-Résibois theory of nonequilibrium statistical mechanics. Approximate solutions are discussed and are found to agree with other theories. The phase transition behaviour and the creation of order which is due to the nonlinear structure of the macroscopic kinetic equations may be interpreted within the more recent theories of far-from-thermal-equilibrium open systems while further study is needed to fill completely the gap between microscopic and macroscopic description.
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