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Mitigating offset frequency drift in frequency combs using a customized power law dispersion.

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    Summary
    This summary is machine-generated.

    We present a novel passive method to reduce phase noise in optical frequency combs by controlling offset frequency drift. This technique customizes dispersion for stable offset frequencies and lower phase noise, demonstrated using quantum cascade laser frequency combs.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Laser Physics

    Background:

    • Phase noise is a critical parameter limiting the performance of optical frequency combs (FCs).
    • Offset frequency drift in FCs contributes significantly to phase noise.
    • Mitigating phase noise is essential for advanced applications of FCs.

    Purpose of the Study:

    • To introduce a new passive technique for mitigating phase noise in optical frequency combs.
    • To reduce the drift of offset frequency in FCs.
    • To demonstrate the feasibility of this technique using quantum cascade laser (QCL) FCs.

    Main Methods:

    • Customizing the dispersion relation to achieve a power law dependence, k(ω)∼ωα.
    • Ensuring a constant ratio between group and phase velocities.
    • Analytical and numerical analysis of quantum cascade laser frequency combs.

    Main Results:

    • Passive mitigation of offset frequency drift is achieved by engineering the dispersion.
    • A constant ratio between group and phase velocities leads to reduced phase noise.
    • Demonstrated that dispersion can be engineered by adjusting the QCL active region thickness.
    • Achieved stable offset frequency combined with low residual group dispersion.

    Conclusions:

    • The proposed passive technique effectively reduces phase noise in optical frequency combs.
    • Engineering the dispersion relation is a viable strategy for mitigating offset frequency drift.
    • This method offers a promising approach for developing high-performance FCs, particularly those based on QCLs.