Elements of Micromaser Physics
  The elements of micromaser physics are reviewed in a tutorial way. The emphasis is on the basic theoretical concepts, not on technical details or experimental subtleties. After a brief treatment of the atom-photon interaction according to the Jaynes-Cummings model, the master equation that governs the dynamics of the one-atom maser is derived. Then the more important properties of the steady states of the one-atom maser are discussed, including the trapped states. The approximations, upon which the standard theoretical model of the one-atom maser is based, are exhibited. The methods by which one calculates statistical properties of the emerging atoms are hinted at. 
Berthold-Georg Englert