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Optimizing auxiliary laser heating for Kerr soliton microcomb generation.

Yanlan Xiao, Sirong Qian, Qingsong Bai

    Optics Letters
    |March 1, 2024
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    Summary

    Optimized auxiliary laser heating enables efficient Kerr soliton frequency comb generation in optical microcavities. This method reduces power requirements and shows potential for on-chip integration.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics

    Background:

    • Auxiliary laser heating is crucial for stabilizing optical microcavities during dissipative Kerr soliton formation.
    • Thermal instability is a key challenge in generating Kerr solitons.

    Purpose of the Study:

    • To optimize auxiliary laser heating for Kerr soliton frequency comb generation.
    • To investigate the impact of laser polarization and resonance on thermal balance and soliton formation.

    Main Methods:

    • Leveraging distinct loss and absorption characteristics of cavity modes.
    • Analyzing photothermal balance between orthogonal pump and auxiliary laser polarizations.
    • Optimizing laser resonance conditions.

    Main Results:

    • Efficient thermal equilibrium achieved even with orthogonal laser polarizations.
    • Auxiliary laser power reduced to 20% of pump laser power while ensuring soliton generation.
    • Soliton comb generation demonstrated with milliwatt-level on-chip laser powers.

    Conclusions:

    • Optimized auxiliary laser heating is an effective method for Kerr soliton generation.
    • The technique allows for reduced power consumption and enhanced stability.
    • This approach is promising for the chip-scale integration of soliton frequency comb devices.