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Updated: May 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Active compensation of the AC Stark shift in a two-photon rubidium optical frequency reference using power modulation
Yorick Andeweg1,2, John Kitching1, Matthew T Hummon1
1National Institute of Standards and Technology, Boulder, Colorado, United States.
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 × 10-14 at 1 s and 2 × 10-14 at 104 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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