Abstract
Double resonance transitions have been observed in laser-cooled and trapped 85Rb atoms. The atoms are cooled on the 5S 1 2 - 5P 3 2 transition and the absorption of a weak probe beam tuned to the 5P 3 2 -4D 5 2 transition is detected. The suitability of this transition as a potential secondary frequency standard in the near infra-red is assessed by using the Autler-Townes splitting as a sensitive probe for the shifts induced by the pump laser. The dependence of the splitting on the pump detuning and intensity are measured. Systematic shifts of a few hundred kHz seem realistic, subject to an accurate knowledge of the detuning of the cooling laser. New precise values are also obtained for the hyperfine constants for the 4D 5 2 level: A = -5.06 ± 0.10 MHz and B = 7.42 ± 0.15 MHz.
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