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Cs microcell optical reference with frequency stability in the low 10-13 range at 1 s.

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    Researchers developed a high-performance optical frequency reference using dual-frequency sub-Doppler spectroscopy (DFSDS) and a cesium vapor microcell. This technology achieves excellent stability, paving the way for advanced optical standards.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Metrology and Measurement Science

    Background:

    • Optical frequency references are crucial for advanced scientific applications.
    • Miniaturized atomic cells offer potential for compact and robust frequency standards.

    Purpose of the Study:

    • To demonstrate a high-performance optical frequency reference using dual-frequency sub-Doppler spectroscopy (DFSDS).
    • To evaluate the stability and performance of a cesium vapor microcell-based laser system.

    Main Methods:

    • Utilized dual-frequency sub-Doppler spectroscopy (DFSDS) with a cesium vapor microfabricated cell.
    • Employed an external-cavity diode laser operating at 895 nm.
    • Compared the microcell-stabilized laser against a cavity-stabilized reference laser.

    Main Results:

    • Achieved a laser instability of 3 × 10-13 at 1 second.
    • Observed a phase noise of +40 dBrad2/Hz at a 1-Hz offset frequency.
    • Demonstrated stability below 5 × 10-14 at 102 seconds, consistent with intermodulation effects.

    Conclusions:

    • Dual-frequency sub-Doppler spectroscopy is a promising technique for developing ultra-stable optical standards.
    • Microfabricated cesium vapor cells are suitable for creating compact and high-performance frequency references.
    • The demonstrated performance validates the potential of DFSDS for next-generation metrology.