We report the direct frequency measurement of the visible 5s2 S01-5s5p P13 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 global positioning system signal. The Sr88 transition is measured to be at 434 829 121 311 (10) kHz. We measure also the Sr88-Sr86 isotope shift to be 163 817.4 (0.2) kHz.
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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 91:(2003), pp. 243002-1-243002-4. [10.1103/PhysRevLett.91.243002]
Precision frequency measurement of visible intercombination lines of strontium
POLI, NICOLA;TINO, GUGLIELMO MARIA
2003
Abstract
We report the direct frequency measurement of the visible 5s2 S01-5s5p P13 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 global positioning system signal. The Sr88 transition is measured to be at 434 829 121 311 (10) kHz. We measure also the Sr88-Sr86 isotope shift to be 163 817.4 (0.2) kHz.
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