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Magneto-optic modulator for high bandwidth cavity length stabilization.

Takuma Nakamura, Shuntaro Tani, Isao Ito

    Optics Express
    |April 7, 2017
    PubMed
    Summary
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    We developed a new magneto-optical method to stabilize optical frequency combs. This technique uses a Yb:fiber laser and a fiber magneto-optic modulator, achieving precise mode stabilization with low phase noise.

    Area of Science:

    • Photonics and Laser Technology
    • Optical Metrology

    Background:

    • Optical frequency combs are crucial for precision measurements.
    • Stabilizing their repetition frequency is essential for high-accuracy applications.
    • Conventional methods often face limitations due to mechanical resonances.

    Purpose of the Study:

    • To introduce a novel magneto-optical approach for stabilizing the repetition frequency of optical frequency combs.
    • To demonstrate the effectiveness of a fiber-based magneto-optic modulator in this stabilization process.

    Main Methods:

    • Development of a Ytterbium (Yb):fiber mode-locked laser.
    • Integration of a fiber-based magneto-optic modulator for mode stabilization.
    • Locking a longitudinal mode to an optical reference signal.

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    Main Results:

    • Achieved stabilization of a longitudinal mode with sub-100 milliradian residual phase noise.
    • The magneto-optic modulator avoids mechanical resonances, enabling broader feedback bandwidths.
    • Demonstrated a novel approach for repetition frequency stabilization.

    Conclusions:

    • The proposed magneto-optical method offers a promising alternative for optical frequency comb stabilization.
    • The fiber-based magneto-optic modulator provides a resonance-free solution for enhanced feedback control.
    • This technique has the potential for broader bandwidths compared to traditional cavity length stabilization methods.