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    This summary is machine-generated.

    We developed a new technique to separate and measure distinct phase noise sources in optical frequency combs. This method identifies residual phase noise, offering new insights into frequency-modulated mode-locked lasers.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Quantum Optics

    Background:

    • Optical frequency combs (OFCs) are crucial tools in precision measurement and spectroscopy.
    • Phase noise in OFCs primarily arises from common mode (carrier-envelope offset frequency) and repetition rate noise.
    • Residual phase noise, distinct from these primary sources, can impact OFC performance but is challenging to isolate.

    Purpose of the Study:

    • To introduce a novel measurement technique for dissecting and quantifying diverse phase noise components in OFCs.
    • To enable the separation of common mode, repetition rate, and residual phase noise contributions for individual comb lines.
    • To provide a method for identifying and measuring previously elusive residual phase noise in frequency-modulated mode-locked lasers.

    Main Methods:

    • Combines subspace tracking algorithms with multi-heterodyne coherent detection.
    • Applies the technique to an optical frequency comb to analyze its phase noise characteristics.
    • Enables the breakdown of overall phase noise into specific contributing factors.

    Main Results:

    • Successfully separated and quantified common mode, repetition rate, and residual phase noise components.
    • Demonstrated the capability to identify and measure residual phase noise sources.
    • Provided the first experimental measurement of residual phase noise in a frequency-modulated mode-locked laser.

    Conclusions:

    • The developed technique effectively distinguishes and quantifies various phase noise sources in optical frequency combs.
    • This method offers a powerful tool for characterizing laser noise and improving OFC stability.
    • The ability to measure residual phase noise opens new avenues for understanding and mitigating noise in advanced laser systems.