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Related Experiment Videos

Microresonator-stabilized extended-cavity diode laser for supercavity frequency stabilization.

Jinkang Lim, Anatoliy A Savchenkov, Andrey B Matsko

    Optics Letters
    |April 1, 2017
    PubMed
    Summary

    We present a cost-effective method to reduce laser noise using a whispering gallery mode microresonator. This stabilizes an extended-cavity diode laser to a high-finesse Fabry-Perot cavity, achieving sub-kilohertz linewidths.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Extended-cavity diode lasers (ECDLs) are crucial for spectroscopy but suffer from inherent noise.
    • Stabilizing lasers to high-finesse optical cavities is essential for achieving narrow linewidths.
    • Whispering gallery mode (WGM) microresonators offer unique optical properties for laser stabilization.

    Purpose of the Study:

    • To demonstrate a simple, compact, and cost-effective laser noise reduction technique.
    • To stabilize an ECDL to a high-finesse Fabry-Perot (F-P) cavity.
    • To achieve sub-kilohertz laser linewidths for enhanced precision.

    Main Methods:

    • Utilizing a crystalline Magnesium Fluoride (MgF2) whispering gallery mode microresonator.
    • Implementing the Pound-Drever-Hall (PDH) technique for error signal generation.

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  • Integrating the microresonator with an extended-cavity diode laser and a 3x10^5 finesse F-P cavity.

    • Main Results:

    • Achieved significant laser noise reduction and stabilization.
    • Reduced the laser linewidth to sub-kilohertz levels.
    • Generated a stable PDH error signal, indicating successful locking.
    • Demonstrated tunability of the pre-stabilized laser over a wide bandwidth.

    Conclusions:

    • The developed method provides a simple, compact, and cost-effective solution for laser noise reduction.
    • Sub-kilohertz linewidth stabilization is achievable using WGM microresonators and F-P cavities.
    • The technique enables precise laser frequency control for applications requiring narrow linewidths and tunability.