title: Theory of two-photon resonance fluorescence.
abstract: We present calculations of the spontaneous-emission spectrum from a two-photon two-level system in the presence of an arbitrarily intense monochromatic field at half of the two-photon transition frequency. The single-photon counterpart to this is called resonance fluorescence. Because of the complexity of the two-photon two-level model, many effects arise that are absent in the one-photon problem. In particular, we show how the Rayleigh scattering from this system is markedly different and discuss the role of Stark shifts on the emission spectrum.
authors.forename: D A
authors.initials: DA
authors.lastname: Holm
authors.forename: M
authors.initials: M
authors.lastname: Sargent Iii