Transitions between excited states of laser-cooled and laser-trapped rubidium and cesium atoms are probed by use of fiber and diode lasers. High-resolution Doppler-free spectra are detected by observation of the absorption and fluorescence of light from the intermediate level of two-step cascade systems. The optical double-resonance spectra show Autler–Townes splitting in the weak probe limit and more complicated spectra for a strongly coupled three-level system.
© 1993 Optical Society of America
Original Manuscript: April 6, 1993
Published: September 1, 1993
R. W. Fox, H. G. Robinson, S. L. Gilbert, L. Hollberg, and J. H. Marquardt, "Optical probing of cold trapped atoms," Opt. Lett. 18, 1456-1458 (1993)