Optical-pumping dips in a homogeneously broadened fluorescence line

Abstract

Several authors have recently discussed and observed optical-pumping dips in inhomogeneously broadened spectral lines. We have observed a qualitatively similar, but fundamentally distinct phenomenon: optical-pumping dips in a homogeneously broaded $D_1$ line of ${}_{}{}^{87}{}_{}{}^{}\mathrm{Rb}$. To our knowledge this represents the first observation of homogeneous-optical-pumping dips.