Hoth, G.
, Sherman, J.
and Gerginov, V.
(2024),
Implementation of coherent detuning to suppress microwave leakage in cesium fountains at NIST, Proceedings of the 2024 European Frequency and Time Forum, Neuchatel, CH, [online], https://doi.org/10.1109/EFTF61992.2024.10722323, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958175
(Accessed March 13, 2025)
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Implementation of coherent detuning to suppress microwave leakage in cesium fountains at NIST
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Abstract
A potential source of frequency bias in atomic fountains is due to atomic interactions with microwave fields outside of the resonant cavity used for Ramsey interrogation. The effects of microwave leakage can be suppressed by detuning the microwaves from the atomic resonance. To apply this technique for microwave leakage while the atoms are above the Ramsey cavity, the additional detuning must introduce zero net phase accumulation between Ramsey interrogation intervals. It has been shown that this can be acheived by manipulating a direct digital synthesizer (DDS) coherently with the DDS system clock. We have developed an implementation of the coherent detuning scheme in which a commercial, off-the-shelf microcontroller is used to control the DDS. We present measurements of the phase evolution achieved with our approach and show that it can be used to suppress a large frequency bias due to microwave leakage while the atoms are above the Ramsey cavity.Proceedings Title
Proceedings of the 2024 European Frequency and Time Forum
Conference Dates
June 24-27, 2024
Conference Location
Neuchatel, CH
Conference Title
37th European Frequency and Time Forum
Pub Type
Conferences
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Keywords
cesium fountains, microwave leakage, direct digital synthesis
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Created October 24, 2024, Updated February 12, 2025