Frequency-comb-referenced tunable diode laser spectroscopy and laser stabilization applied to laser cooling

Thomas Fordell (Corresponding Author), Anders E. Wallin, Thomas Lindvall, Markku Vainio, Mikko Merimaa

    Research output: Contribution to journalArticleScientificpeer-review


    Laser cooling of trapped atoms and ions in optical clocks demands stable light sources with precisely known absolute frequencies. Since a frequency comb is a vital part of any optical clock, the comb lines can be used for stabilizing tunable, user-friendly diode lasers. Here, a light source for laser cooling of trapped strontium ions is described. The megahertz-level stability and absolute frequency required are realized by stabilizing a distributed-feedback semiconductor laser to a frequency comb. Simple electronics is used to lock and scan the laser across the comb lines, and comb mode number ambiguities are resolved by using a separate, saturated absorption cell that exhibits easily distinguishable hyperfine absorption lines with known frequencies. Due to the simplicity, speed, and wide tuning range it offers, the employed technique could find wider use in precision spectroscopy.
    Original languageEnglish
    Pages (from-to)7476-7482
    JournalApplied Optics
    Issue number31
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


    • laser stabilization
    • lasers, distributed-feedback
    • laser cooling
    • spectroscopy, diode lasers
    • spectroscopy, saturation


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