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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Micro-optics

    Background:

    • High-power semiconductor lasers are crucial for various applications.
    • Achieving ultra-narrow linewidth and low frequency noise in semiconductor lasers remains a challenge.
    • Whispering gallery mode microresonators offer unique optical properties for laser stabilization.

    Purpose of the Study:

    • To stabilize a high-power distributed feedback (DFB) semiconductor laser operating at 2.05 μm.
    • To significantly reduce the frequency noise and linewidth of the DFB laser.
    • To demonstrate the effectiveness of crystalline whispering gallery mode microresonators for laser stabilization.

    Main Methods:

    • Utilized a crystalline whispering gallery mode microresonator to stabilize a 2.05 μm DFB semiconductor laser.
    • Measured laser frequency noise across a wide Fourier frequency range (10 Hz to 1 MHz).
    • Characterized the instantaneous and integral linewidth of the stabilized laser.

    Main Results:

    • Achieved frequency noise below 100 Hz/√Hz.
    • Reduced the instantaneous linewidth by four orders of magnitude compared to the free-running laser.
    • Measured an instantaneous linewidth of 15 Hz and an integral linewidth approaching 100 Hz.
    • Integrated the stabilized laser with polarization-maintaining fiber and an optical isolator.

    Conclusions:

    • The crystalline whispering gallery mode microresonator effectively stabilized the high-power DFB semiconductor laser.
    • The stabilization technique dramatically improved laser frequency noise and linewidth.
    • This work paves the way for high-performance lasers in demanding applications.