Broadband, unpolarized repumping and clearout light sources for Sr+ single-ion clocks

Thomas Fordell, Thomas Lindvall, P. Dubé, A. A. Madej, Anders E. Wallin, Mikko Merimaa

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)


    Future transportable optical clocks require compact and reliable light sources. Here, broadband, unpolarized repumper and state clearout sources for Sr+ single-ion optical clocks are reported. These turn-key devices require no frequency stabilization or external modulators. They are fiber based, inexpensive, and compact. Key characteristics for clock operation are presented, including optical spectra, induced light shifts, and required extinction ratios. Tests with an operating single-ion standard show a clearout efficiency of 100%. Compared to a laser-based repumper, the achievable fluorescence rates for ion detection are a few tens of percent lower. The resulting ion kinetic temperature is 1-1.5 mK, near the Doppler limit of the ion system. Similar repumper light sources could be made for Ca+ (866 nm) and Ba+ (650 nm) using semiconductor gain media.

    Original languageEnglish
    Pages (from-to)1822-1825
    JournalOptics Letters
    Issue number8
    Publication statusPublished - 1 Jan 2015
    MoE publication typeA1 Journal article-refereed


    • spectroscopy, trapped ion
    • metrology
    • fiber optics
    • fiber devices and optical amplifiers


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