Controlling light shifts in chip-scale atomic beam clocks

Abstract

Chip-scale atomic beam clocks are being investigated to extend the range of clock stability achievable in low-power timing applications. Here, we demonstrate a centimeter-scale, Ramsey coherent population trapping (CPT) clock based on a microfabricated Cs atomic beam device and investigate the interplay between light shifts and Doppler shifts that determines its leading clock systematics. We show that these shifts exhibit competing dependencies on CPT light parameters, leading to ``doubly-insensitive" operating points where the clock frequency is simultaneously insensitive to laser frequency and power. We further demonstrate a method for controlling key clock shifts using spectroscopic signatures from the atomic beam that is compatible with fully-integrated operation. The clock achieves a fractional frequency stability of 2 × 10⁻¹⁰ at 1 s and sub-μs drift over nearly 17 hours, with leading CPT light systematics controlled below the 10⁻¹² level.

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BibTeX RIS

BibTeX

@misc{staron2026controlling,
  title = {{Controlling light shifts in chip-scale atomic beam clocks}},
  author = {Alexander Staron and Mingwu Lu and Ruwan Senaratne and Travis Autry and Susan Schima and John Kitching and William McGehee},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.29317},
  eprint = {2608.29317},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.29317},
}

RIS

TY  - UNPB
TI  - Controlling light shifts in chip-scale atomic beam clocks
AU  - Alexander Staron
AU  - Mingwu Lu
AU  - Ruwan Senaratne
AU  - Travis Autry
AU  - Susan Schima
AU  - John Kitching
AU  - William McGehee
PY  - 2026
DA  - 2026/08/29
PB  - arXiv
DO  - 10.48550/arxiv.2608.29317
UR  - https://arxiv.org/abs/2608.29317
AB  - Chip-scale atomic beam clocks are being investigated to extend the range of clock stability achievable in low-power timing applications. Here, we demonstrate a centimeter-scale, Ramsey coherent population trapping (CPT) clock based on a microfabricated Cs atomic beam device and investigate the interplay between light shifts and Doppler shifts that determines its leading clock systematics. We show that these shifts exhibit competing dependencies on CPT light parameters, leading to ``doubly-insensitive" operating points where the clock frequency is simultaneously insensitive to laser frequency and power. We further demonstrate a method for controlling key clock shifts using spectroscopic signatures from the atomic beam that is compatible with fully-integrated operation. The clock achieves a fractional frequency stability of 2 × 10^−10 at 1 s and sub-μs drift over nearly 17 hours, with leading CPT light systematics controlled below the 10^−12 level.
ER  -

Abstract

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