Abstract
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
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