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Relative intensity noise in a multi-Stokes Brillouin laser.

Ananthu Sebastian, Irina V Balakireva, Schadrac Fresnel

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    Summary

    This study reveals significant intensity noise reduction in multi-Stokes Brillouin fiber lasers. Optimal parameters were identified for low-noise operation, crucial for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Brillouin fiber lasers are essential for various applications.
    • Understanding and mitigating relative intensity noise (RIN) is critical for laser performance.
    • Cascaded Brillouin scattering dynamics influence laser noise properties.

    Purpose of the Study:

    • To investigate the relative intensity noise (RIN) properties of a multi-Stokes Brillouin fiber ring laser.
    • To analyze the noise dynamics of cascaded Brillouin scattering.
    • To identify optimal operating parameters for low-noise laser performance.

    Main Methods:

    • Experimental analysis of intensity noise for each Stokes wave.
    • Investigation of fiber ring quality factor and Brillouin gain detuning effects on RIN.
    • Numerical modeling using coupled-mode equations to replicate experimental findings.

    Main Results:

    • Observed up to 20 dB/Hz intensity noise reduction compared to the input pump laser.
    • Demonstrated the impact of fiber ring quality factor on RIN amplitude reduction and relaxation frequency.
    • Showcased the influence of Brillouin gain detuning on RIN reduction.

    Conclusions:

    • The study successfully determined optimal parameter values for operating the multi-Stokes laser in a low-noise regime.
    • Experimental and numerical results provide a comprehensive understanding of noise dynamics in these lasers.
    • Findings are crucial for developing high-performance, low-noise fiber laser sources.