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arXiv · 2511.19702

Active compensation of the AC Stark shift in a two-photon rubidium optical frequency reference using power modulation

Yorick Andeweg·John Kitching·Matthew T. Hummon
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Abstract

We implement a feedback protocol to suppress the AC Stark shift in a two-photon rubidium optical frequency reference, reducing its sensitivity to optical power variations by a factor of 1000. This method alleviates the tradeoff between short-term and long-term stability imposed by the AC Stark shift, enabling us to simultaneously achieve instabilities of $3\times10^{-14}$ at 1 s and $2\times10^{-14}$ at $10^4$ s. We also quantitatively describe, and experimentally explore, a stability limit imposed on clocks using this method by frequency noise on the local oscillator.

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Yorick Andeweg, John Kitching, Matthew T. Hummon. 2025-11-24. Active compensation of the AC Stark shift in a two-photon rubidium optical frequency reference using power modulation. https://doi.org/10.1103/25md-vv43

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