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Updated: Oct 26, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Conversion efficiency of soliton Kerr combs.

Jae K Jang, Yoshitomo Okawachi, Yun Zhao

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    |July 30, 2021
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    Summary

    We studied Kerr frequency comb efficiency, finding three scaling regimes based on cavity loss. Microresonator combs in the electronically detectable regime are inefficient, impacting integrated photonic devices.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Kerr frequency combs are crucial for precise frequency measurements.
    • Soliton modelocking enhances comb properties but efficiency is a key challenge.
    • Cavity loss mechanisms significantly influence comb performance.

    Purpose of the Study:

    • To investigate the conversion efficiency (CE) of soliton modelocked Kerr frequency combs.
    • To understand the relationship between CE and cavity free spectral range (FSR).
    • To identify factors limiting CE in microresonator-based combs.

    Main Methods:

    • Theoretical analysis of CE scaling regimes.
    • Experimental measurements of CE under critical coupling.
    • Numerical simulations to assess mode crossing effects.

    Main Results:

    • Identified three distinct scaling regimes for CE with FSR.
    • Experimental verification of theoretical predictions for CE.
    • Mode crossings were found to negatively impact achievable CE.
    • Microresonator combs in the electronically detectable regime exhibit low CE.

    Conclusions:

    • Cavity loss contributions (coupling vs. propagation) dictate CE scaling.
    • Optimizing microresonator design is crucial for efficient integrated Kerr comb devices.
    • Electronically detectable FSRs present a significant challenge for high-efficiency Kerr combs.