A compact cold-atom double-resonance clock

A. Bregazzi; E. Batori; B. Lewis; C. Affolderbach; G. Mileti; E. Riis; P. Griffin

doi:10.1117/12.2657390

8 March 2023 A compact cold-atom double-resonance clock

A. Bregazzi, E. Batori, B. Lewis, C. Affolderbach, G. Mileti, E. Riis, P. Griffin

Proceedings Volume 12447, Quantum Sensing, Imaging, and Precision Metrology; 1244707 (2023) https://doi.org/10.1117/12.2657390
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

We present a demonstration of a cold-atom optical-microwave double resonance (DR) Ramsey clock utilising an additively manufactured loop-gap-resonator cavity and grating magneto-optical trap (GMOT). The use of additive manufacturing allows for complex cavity structures, more difficult to produce with traditional machining techniques, while the GMOT architecture significantly simplifies the optical system required to trap and cool the atomic sample. In the current demonstration a single laser is used to trap < 3 × 10^{6 87}Rb atoms, cool them to below 10 µK, optically pump and read-out state populations of the atoms after microwave interrogation. A Ramsey-type interrogation scheme is employed with an empirically evaluated optimum free evolution time of 10 ms, limited by the loss of signal due to atoms falling out of the read-out beam. We demonstrate a short-term stability of < 2×10⁻¹¹τ^−1/2, in reasonable agreement with the predicted short-term stability based on the signal to noise ratio of the measured Ramsey fringes. Excellent field homogeneity of the cavity microwave field is demonstrated though Rabi oscillations, while almost complete optical pumping and good field orientation is evidenced by Zeeman spectroscopy of the ground-state hyperfine energy levels. This work is a novel approach towards more compact and portable cold-atom microwave clocks with significant potential for further miniaturization of the system.

Conference Presentation

Citation Download Citation

A. Bregazzi, E. Batori, B. Lewis, C. Affolderbach, G. Mileti, E. Riis, and P. Griffin "A compact cold-atom double-resonance clock", Proc. SPIE 12447, Quantum Sensing, Imaging, and Precision Metrology, 1244707 (8 March 2023); https://doi.org/10.1117/12.2657390

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