SPONTANEOUS AND STIMULATED-EMISSION OF RADIATION FROM AN ATOM IN A RESONATOR

Using a tight binding approach, the Green's function for radiation fie lds (RF) in a resonator is calculated by considering that they are int eracting with a vacuum field in an external environment outside the re sonator. The general formulas for the rates of the spontaneous and sti mulated emission from an atom in an excited state are given, of which the latter is evaluated for an initial state with only one photon. The emission rate is obtained for an arbitrary ratio between the waveleng th of RF and the cavity length. The stimulated emission is also contro llable by changing an initial one-photon state and an atomic position.