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    We developed a tunable laser frequency locking technique using four-wave mixing (FWM) for enhanced atomic sensor performance. This method achieves robust laser stabilization with a wide tuning range, improving atomic interferometers and magnetometers.

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    Area of Science:

    • Atomic physics
    • Laser spectroscopy
    • Quantum optics

    Background:

    • Precise laser frequency control is crucial for advanced atomic sensors.
    • Existing techniques face limitations in tuning range and signal quality.

    Purpose of the Study:

    • To present a widely tunable laser frequency offset locking technique.
    • To improve the performance of atomic sensors like interferometers and magnetometers.

    Main Methods:

    • Utilizing four-wave mixing (FWM) for laser frequency stabilization.
    • Employing a modulation transfer technique in a double-lambda atomic system.
    • Leveraging Raman-amplified probe and conjugate light for enhanced signals.

    Main Results:

    • Achieved a wide tuning range of several GHz by adjusting pump light detuning.
    • Demonstrated robust laser frequency stabilization with high signal amplitude and ultra-narrow spectral characteristics.
    • Obtained an atomic coherence-enhanced error signal with improved amplitude and gradient compared to frequency modulation spectroscopy.

    Conclusions:

    • The presented FWM-based technique offers superior laser frequency stabilization.
    • This method significantly enhances the performance of atomic sensors.
    • Enables improved stability for atomic interferometers and magnetometers.