Effects of radiative decay in four-wave-mixing spectroscopy: Narrow resonances produced by nonconservation of population, alignment, and orientation

Abstract
We present experimental and theoretical results describing the presence of radiative-decay-induced narrow resonances in systems which do not conserve population, alignment, or orientation. We show how spectroscopic line-shape analysis of the nonlinear response can be used to determine all of the relaxation parameters characterizing a two-level atom.