Autler-Townes effect

Etymology
Named after American physicists and  who discovered the effect in 1955.

Noun

 * 1)  A dynamical Stark effect corresponding to the case when an oscillating electric field (e.g., that of a laser) is tuned in resonance (or close) to the transition frequency of a given spectral line, and resulting in a change of the shape of the absorption/emission spectra of that spectral line.