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Atomically referenced 1-GHz optical parametric oscillator frequency comb.

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    Summary

    We developed a novel femtosecond optical parametric oscillator (OPO) frequency comb. This new OPO comb provides absolute traceability and wide tooth spacing for spectroscopy and spectrograph calibration.

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    Area of Science:

    • Physics
    • Optical Engineering
    • Spectroscopy

    Background:

    • Femtosecond optical parametric oscillator (OPO) frequency combs offer broad spectral coverage.
    • Applications in high-resolution spectroscopy and astrophotonic spectrograph calibration require absolute traceability and wide comb-tooth spacing.
    • These attributes have been challenging to achieve simultaneously in a single OPO comb.

    Purpose of the Study:

    • To develop a single femtosecond OPO frequency comb with both absolute traceability and wide comb-tooth spacing.
    • To enable advanced applications in high-resolution spectroscopy and spectrograph calibration.

    Main Methods:

    • A 1-GHz Ti:sapphire pumped OPO comb was developed.
    • Repetition and offset frequencies were stabilized using Rb-stabilised microwave and laser oscillators.
    • The technique avoids the need for super-continuum generation.

    Main Results:

    • Fully stabilized frequency combs were achieved for both the Ti:sapphire laser and the OPO.
    • Sub-MHz comb-tooth linewidths and multi-hour locking stability were demonstrated.
    • Absolute traceability and wide comb-tooth spacing were simultaneously achieved.

    Conclusions:

    • The developed OPO frequency comb successfully provides absolute traceability and wide comb-tooth spacing.
    • This represents a significant advancement for high-resolution spectroscopy and astrophotonic spectrograph calibration.
    • The method offers a robust and efficient solution without requiring super-continuum generation.