Reduction of light shifts in Ramsey spectroscopy with a combined error signal

Abstract

Light-induced frequency shifts can be a key limiting contribution to the mid and long-term frequency instability in atomic clocks. In this letter, we demonstrate the experimental implementation of the combined error signal interrogation protocol to a cold-atom clock based on coherent population trapping (CPT) and Ramsey spectroscopy. The method uses a single error signal that results from the normalized combination of two error signals extracted from two Ramsey sequences of different dark periods. The single combined error signal is used to stabilize the atomic clock frequency. Compared to the standard Ramsey-CPT interrogation, this method reduces the clock frequency sensitivity to light-shift variations by more than one order of magnitude. This method can be applied in various kinds of Ramsey-based atomic clocks, sensors and instruments.

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Cited by in corpus (4)

• Universal methods for suppressing the light shift in atomic clocks using power modulation
• Advanced light-shift compensation protocol in a continuous-wave microcell atomic clock
• Light-shift mitigation in a microcell-based atomic clock with Symmetric Auto-Balanced Ramsey spectroscopy
• In-situ ac Stark shift Detection in Light Storage Spectroscopy