The excitation of Rydberg atom transitions by submillimeter-wavelength radiation in high-<i>Q</i> cavities forms the basis of the micromaser. The excitation dynamics of a micromaser is known to be dependent on the detailed photon statistics in the interaction cavity and can exhibit well-known collapses and revivals of the atomic inversion, dipole moment, and photon number. We study these effects in a two-photon model in which the time evolution is exactly periodic. We study the field entropy in two two-photon cases and link the fluctuations in the field phase to the changes in the field entropy. We also calculate the statistical <i>Q</i> function of the field and show how the periodicity of the two-photon dynamics is linked to a periodic splitting of the <i>Q</i> function in phase space. Finally this periodicity is linked to the nature of the atom-field dressed states involved in two-photon resonance.
© 1990 Optical Society of America
S. J. D. Phoenix and P. L. Knight, "Periodicity, phase, and entropy in models of two-photon resonance," J. Opt. Soc. Am. B 7, 116-124 (1990)