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Common-mode phase noise suppression with an open-loop differential phasemeter.

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    We developed a new open-loop phasemeter for differential optical interferometry. This technique improves phase sensitivity and common-mode noise rejection, even with unstable individual channels.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Interferometry

    Background:

    • Differential optical interferometry is crucial for precise measurements.
    • Conventional phasemeters struggle with common-mode signal dynamics and require high dynamic range.
    • Tracking optical phase differences can be challenging due to noise and signal instability.

    Purpose of the Study:

    • To introduce a novel open-loop phasemeter topology for direct differential phase recovery.
    • To reduce dynamic range requirements by mitigating common-mode signal dynamics before phase tracking.
    • To enhance the performance of differential optical interferometric measurements.

    Main Methods:

    • Developed an open-loop phasemeter topology for differential phase recovery.
    • Implemented a technique to remove common-mode signal dynamics prior to phase tracking.
    • Experimentally demonstrated a phase difference measurement using the proposed technique.

    Main Results:

    • Achieved a phase sensitivity of 1 × 10-6 rad/√Hz.
    • Demonstrated a common-mode noise rejection of 141 dB.
    • Successfully measured phase differences even when individual channels experienced cycle slips and were unable to track phase.

    Conclusions:

    • Direct differential phase recovery offers a robust solution for optical interferometry.
    • The proposed technique significantly improves phase sensitivity and noise rejection.
    • This method enables accurate phase measurements in challenging conditions with unstable channels.