Abstract

Recent work indicates that an interesting class of nonlinear optical phenomena exists in which weak electronic coupling between clusters of a few atoms has an important influence on coherent optical interactions. In this paper we consider primarily pair-pumped upconversion lasing, optical suppression of the Van der Waal's force, seven-line resonance fluorescence spectra in stationary pair systems, two-atom coherence and dark processes in four-wave mixing spectroscopy.

© 1988 Optical Society of America