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Ultranarrow linewidth photonic-atomic laser



Wei Zhang, Liron Stern, David R. Carlson, Douglas G. Bopp, Zachary L. Newman, Songbai Kang, John Kitching, Scott Papp


Lasers with high spectral purity can enable a diverse application space, including precision spectroscopy, coherent high-speed communications, physical sensing, and manipulation of quantum systems. Already, meticulous design and construction of bench Fabry-Perot cavities has madepossible dramatic achievements in active laser-linewidth reduction, predominantly for optical-atomic clocks. Yet there is increasing demand for miniaturized laser systems operating with high performance in ambient environments. Here, we report a compact and robust photonic-atomic laser comprising a 2.5-cm long, 20,000 finesse, monolithic Fabry-Perot cavity integrated with a micromachined rubidium vapor cell. By leveraging the short-time frequency stability of the cavity and the long-time frequency stability of atoms, we realize an ultranarrow-line width laser that enables integration for extended measurements. Specifically, our laser supports a fractional-frequency stability of 1×10−13 after 20 ms of measurement time,7×10−13 after 300 s,an integrated linewidth of 25 Hz that results from thermal noise, a Lorentzian linewidth as low as 0.06 Hz2/Hz, and a passive vibration immunity as low as 10−10/g. Our work explores hybrid laser systems with monolithic photonic and atomic packages based on physical design.


Atomic stabilization, Optical cavities, Ultranarrow lasers


Zhang, W. , Stern, L. , Carlson, D. , Bopp, D. , Newman, Z. , Kang, S. , Kitching, J. and Papp, S. (2020), Ultranarrow linewidth photonic-atomic laser, Optica, [online], (Accessed April 22, 2024)
Created January 7, 2020, Updated October 12, 2021