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Precision frequency measurement of visible intercombination lines of strontium

G. Ferrari·P. Cancio·R. Drullinger·G. Giusfredi·N. Poli·M. Prevedelli·C. Toninelli·G. M. Tino
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Abstract

We report the direct frequency measurement of the visible 5s$^2$ $^1$S$_0$-5s 5p$^3$P$_1$ intercombination line of strontium that is considered a possible candidate for a future optical frequency standard. The frequency of a cavity-stabilized laser is locked to the saturated fluorescence in a thermal Sr atomic beam and is measured with an optical-frequency comb-generator referenced to the SI second through a GPS signal. The $^{88}$Sr transition is measured to be at 434 829 121 311 (10) kHz. We measure also the $^{88}$Sr-$^{86}$Sr isotope shift to be 163 817.4 (0.2) kHz.

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G. Ferrari, P. Cancio, R. Drullinger, G. Giusfredi, N. Poli, M. Prevedelli, C. Toninelli, G. M. Tino. 2003-11-06. Precision frequency measurement of visible intercombination lines of strontium. https://doi.org/10.1103/physrevlett.91.243002

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