Figure 2
From: Enhanced spectral profile in the study of Doppler-broadened Rydberg ensembles
NEPH as a function of the intensity of the input probe field at (a) different intensities of the coupling field for the transition to Rydberg state of |38D 5/2〉 and (b) different principal quantum numbers of Rydberg states for the coupling intensity of 18 W/cm2. Both measurements have the same polarization configuration of σ + − σ +. The coupling intensities in units of W/cm2 in (a) and selected Rydberg states in (b) are shown in the legends. Solid lines are the curves to guide the eye. The typical errors (standard deviation) are smaller than the symbol size, which do not reveal in the following figures.
