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Sub-kilohertz laser linewidth narrowing using polarization spectroscopy.

Joshua S Torrance, Ben M Sparkes, Lincoln D Turner

    Optics Express
    |July 14, 2016
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    Summary
    This summary is machine-generated.

    Polarization spectroscopy offers a robust atomic reference for laser frequency stabilization. This method achieved sub-kilohertz laser linewidth narrowing, surpassing conventional techniques.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Laser Spectroscopy
    • Quantum Optics

    Background:

    • Laser frequency stabilization is crucial for precision measurements.
    • Conventional atomic references have limitations like reduced capture range.
    • High-bandwidth laser frequency stabilization often requires complex optical modulation.

    Purpose of the Study:

    • To demonstrate polarization spectroscopy as an absolute atomic reference for laser frequency stabilization.
    • To achieve sub-kilohertz laser spectral linewidth narrowing.
    • To showcase the advantages of polarization spectroscopy over conventional methods.

    Main Methods:

    • Utilizing polarization spectroscopy with high-bandwidth feedback for laser frequency locking.
    • Employing an optically pumped atomic gas to create a frequency-dependent birefringence.
    • Implementing a locking signal based on the subtraction of two orthogonal polarization signals.
    • Measuring noise-limited servo bandwidth.

    Main Results:

    • Demonstrated sub-kilohertz laser spectral linewidth narrowing (600±100 Hz).
    • Achieved a noise-limited servo bandwidth comparable to high-finesse optical cavities.
    • Suppressed subsidiary resonances for an improved capture range.
    • Reduced laser intensity noise to the shot noise limit.

    Conclusions:

    • Polarization spectroscopy is a beneficial absolute atomic reference for laser frequency stabilization.
    • The technique offers high-bandwidth feedback without the complexity of optical modulation.
    • This method provides a superior alternative for achieving narrow laser linewidths.