By combining an ultralow-loss silicon nitride reference cavity with a diode laser, the interrogation of a strontium-ion optical clock is possible with excellent accuracy. The development is a step towards miniature, integrated optical clocks.
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Liu, J. Building atomic clock lasers with integrated photonics. Nat. Photon. 19, 226–227 (2025). https://doi.org/10.1038/s41566-025-01634-z
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DOI: https://doi.org/10.1038/s41566-025-01634-z