Measurement of the emission and absorption spectra of strongly driven two-level atoms

An investigation was made of the resonance fluorescence and absorption spectra of sodium atoms [corresponding to the 3²S_1/2(F = 2)–3²P_3/2(F' = 3) transition] excited by a strong monochromatic field, as well as by combinations of strong and tunable fields. The experimental results obtained were found to be in good agreement with the theoretical predictions.