Autler-Townes spectroscopy of the 5S1/2-5P3/2-44D cascade of cold 85Rb atoms
Abstract
We study nonlinear optical effects in the laser excitation of Rydberg states. 5S1/2 and 5P3/2 levels of 85Rb are strongly coupled by a strong laser field and probed by a weak laser tuned to the 5P3/2 - 44D Rydberg resonance. We observe high contrast Autler-Townes spectra which are dependent on the pump polarization, intensity and detuning. The observed behavior agrees with calculations, which include the effect of optical pumping.
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