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Laser diode self-injection locking to an integrated high-Q Fabry-Perot microresonator.

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    We demonstrate self-injection locking (SIL) of laser diodes to chip-integrated Fabry-Perot microresonators. This technique achieves a fundamental thermorefractive-noise-limited laser, advancing compact, low-noise laser systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Self-injection locking (SIL) is key for compact, narrow-linewidth lasers.
    • Microresonators offer high quality factors and large mode volumes, reducing noise.
    • Thermorefractive noise (TRN) is a fundamental limitation in lasers.

    Purpose of the Study:

    • To extend self-injection locking (SIL) to chip-integrated Fabry-Perot (FP) microresonators.
    • To develop a theoretical model and experimentally validate SIL with FP microresonators.
    • To achieve a fundamental thermorefractive-noise-limited laser on a chip.

    Main Methods:

    • Fabrication of silicon nitride FP microresonators with photonic crystal reflectors using ultraviolet lithography.
    • Implementation of evanescent side-coupling for precise tuning of the SIL feedback mechanism.
    • Development of a theoretical model to describe the SIL phenomenon in FP microresonators.

    Main Results:

    • Experimental demonstration of self-injection locking (SIL) to chip-integrated FP microresonators.
    • Achieved a laser performance limited by fundamental thermorefractive noise (TRN).
    • Excellent agreement between the theoretical model and experimental results.

    Conclusions:

    • Self-injection locking (SIL) is successfully extended to chip-integrated Fabry-Perot (FP) microresonators.
    • The developed technique enables compact, low-noise laser systems with TRN-limited performance.
    • Results are highly relevant for advancing chip-scale laser technology.