 The notion of quasi-energy in treating the general AC Stark effect was later developed by Nikishov and Ritis in 1964 and onward.This more general method of approaching the problem developed into the "dressed atom" model describing the interaction between lasers and atoms

Prior to the 1970s there were various conflicting predictions concerning the fluorescence spectra of atoms due to the AC Stark effect at optical frequencies.In 1974 the observation of Mollow triplets verified the form of the AC Stark effect using visible light.