Precision Frequency Measurement of Visible Intercombination Lines of Strontium

G. Ferrari, P. Cancio, R. Drullinger, G. Giusfredi, N. Poli, M. Prevedelli, C. Toninelli, and G. M. Tino
Phys. Rev. Lett. 91, 243002 – Published 10 December 2003

Abstract

We report the direct frequency measurement of the visible 5s2S015s5pP13 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 Sr88Sr86 isotope shift to be 163 817.4 (0.2) kHz.

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  • Received 12 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.243002

©2003 American Physical Society

Authors & Affiliations

G. Ferrari1, P. Cancio2, R. Drullinger1, G. Giusfredi2, N. Poli1, M. Prevedelli3, C. Toninelli1, and G. M. Tino1

  • 1Dipartimento di Fisica and LENS, Università di Firenze, INFM-UdR Firenze, Polo Scientifico, 50019 Sesto Fiorentino, Italy
  • 2Istituto Nazionale di Ottica Applicata, Largo Enrico Fermi 2, 50125 Firenze, Italy
  • 3Dipartimento di Chimica Fisica, Università di Bologna, Via del Risorgimento 4, 40136 Bologna, Italy

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Issue

Vol. 91, Iss. 24 — 12 December 2003

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