Abstract

Fluorescence line narrowing spectroscopy is a site selective technique used in condensed phase materials to eliminate inhomogeneous broadening. A narrowband laser is used to excite a subset of sites that make up an inhomogeneously broadened band so the resulting fluorescence spectrum comes only from the sites excited and is sharp- lined. We report the use of fully resonant four-wavemixing spectroscopy to eliminate inhomogeneous broadening through the same kind of site selection. This type of four-wave mixing spectroscopy was predicted by Druet et al.,¹ but it has not been observed.

© 1987 Optical Society of America