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    Researchers developed a record-breaking semiconductor laser using integrated photonics. This ultra-high Q resonator laser achieves unprecedented frequency stability, surpassing commercial fiber lasers.

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    Area of Science:

    • Integrated photonics
    • Laser physics
    • Optical resonators

    Background:

    • Semiconductor lasers are crucial for various applications but often limited by frequency noise.
    • Achieving ultra-low frequency noise in lasers is essential for high-precision measurements and communications.
    • Integrated photonics offers a path towards compact and stable laser systems.

    Purpose of the Study:

    • To demonstrate a novel hybrid integrated laser system with ultra-high Q factor.
    • To achieve record-low frequency noise and linewidth performance in a semiconductor laser.
    • To compare the performance of the integrated laser against commercial fiber lasers.

    Main Methods:

    • Self-injection-locking a diode laser to a 1.41 m long, ultra-high Q integrated resonator.
    • Utilizing a hybrid integrated photonic chip system.
    • Characterizing frequency noise and linewidth at various offset frequencies.

    Main Results:

    • Achieved a frequency noise floor of 0.006 Hz²/Hz at 4 MHz offset.
    • Demonstrated a Lorentzian linewidth below 40 mHz, a record for semiconductor lasers.
    • Exhibited frequency noise of 200 Hz²/Hz at 100 Hz offset, surpassing commercial fiber lasers.

    Conclusions:

    • The hybrid integrated laser represents a significant advancement in integrated photonics.
    • This technology achieves unprecedented frequency stability, exceeding commercial benchmarks.
    • The system's performance opens new possibilities for compact, high-performance laser sources.