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Ultra-precise optical-frequency stabilization with heterogeneous III-V/Si lasers.

Liron Stern, Wei Zhang, Lin Chang

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    |September 15, 2020
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    Researchers developed a chip-scale laser with a 60 Hz linewidth and 2.5×10-13 stability. This breakthrough in integrated photonics offers a compact, cost-effective, and stable narrow-linewidth laser source.

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    Area of Science:

    • Semiconductor integrated photonics
    • Laser physics
    • Optical metrology

    Background:

    • Growing demand for low-noise, frequency-tunable semiconductor lasers.
    • Need for narrow spectral linewidths comparable to bulk and fiber lasers.

    Purpose of the Study:

    • Demonstrate laser-frequency stabilization using a hybrid III/V-Si tunable laser and a photonic resonator.
    • Achieve chip-scale optical-frequency references with high stability and narrow linewidth.

    Main Methods:

    • Heterogeneously integrated III/V-Si widely tunable laser.
    • High-finesse, thermal-noise-limited photonic resonator for frequency stabilization.
    • Characterization of laser noise contributions (residual amplitude modulation, photodetection noise).

    Main Results:

    • Achieved an integrated linewidth of 60 Hz.
    • Demonstrated a fractional frequency stability of 2.5×10-13 at 1 s integration time.
    • Explored stabilization potential with lower thermal noise resonators.

    Conclusions:

    • Hybrid integrated photonics architecture provides a chip-scale optical-frequency reference.
    • Enables development of widely tunable, compact, cost-effective, stable, narrow-linewidth lasers.
    • Potential applications in communications, spectroscopy, and metrology.