Absorption spectra of cold Cs atoms in a magneto-optical trap under the influence of a strong external pump laser field with arbitrary detuning and intensity have been systematically investigated. The spectra featured the Rabi sidebands of each transition, and their behavior was nicely fitted by the dressed-atom theory. A pronounced dispersion-type profile with sub-natural linewidth at the pump frequency may be attributable to the stimulated Raman process by sublevels that are lightshifted and optically pumped by the pump laser.
© 1996 Optical Society of America
Masaharu Mitsunaga, Tetsuya Mukai, Kimitaka Watanabe, and Takaaki Mukai, "Dressed-atom spectroscopy of cold Cs atoms," J. Opt. Soc. Am. B 13, 2696-2700 (1996)