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    We combined optical and electronic feedback to significantly narrow the linewidth of distributed Bragg reflector (DBR) lasers. This technique reduces laser noise across all frequencies, achieving a sub-kilohertz linewidth for robust laser applications.

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    Area of Science:

    • Photonics and Laser Technology
    • Optical Engineering
    • Quantum Optics

    Background:

    • Distributed Bragg reflector (DBR) lasers are crucial components in various photonic applications.
    • High-frequency and low-frequency noise in DBR lasers limit their performance and applications.
    • Narrowing laser linewidth is essential for high-precision measurements and advanced optical systems.

    Purpose of the Study:

    • To demonstrate a novel feedback technique for significantly narrowing the linewidth of DBR lasers.
    • To reduce both high-frequency and low-frequency noise components in DBR lasers.
    • To achieve a robust sub-kilohertz linewidth for DBR lasers across a broad wavelength range.

    Main Methods:

    • Utilized optical feedback from a long external fiber path to mitigate high-frequency laser noise.
    • Incorporated an electro-optic modulator within the optical feedback path for high-bandwidth electronic feedback.
    • Employed electronic feedback to achieve stable locking to a reference cavity, suppressing low-frequency noise.

    Main Results:

    • Achieved a significant reduction in the frequency noise power spectral density across all frequencies.
    • Narrowed the laser linewidth from a free-running 1.1 MHz to a stabilized 1.9 kHz.
    • The stabilized linewidth was limited by the detection system's resolution, indicating potential for further improvement.

    Conclusions:

    • The combination of optical and electronic feedback is highly effective in narrowing DBR laser linewidths.
    • This method enables the construction of robust DBR lasers with sub-kilohertz linewidths.
    • The demonstrated technique is applicable across a broad range of wavelengths, enhancing laser versatility.