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    We developed a novel coherence-length isolation scheme for mobile-probe optical coherence tomography (OCT). This method enhances image stability and signal-to-noise ratio, overcoming limitations of previous OCT techniques.

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    Area of Science:

    • Biomedical Optics
    • Optical Engineering
    • Medical Imaging

    Background:

    • Mobile-probe optical coherence tomography (OCT) suffers from image degradation due to probe motion.
    • Common-path OCT mitigates motion but is incompatible with balanced detection, crucial for swept-source OCT.
    • Balanced detection is essential for suppressing noise and artifacts in swept-source OCT.

    Purpose of the Study:

    • To propose a novel coherence-length isolation scheme for mobile-probe OCT.
    • To integrate the motion stability of common-path OCT with the performance of balanced detection.
    • To achieve high-quality and stable OCT imaging in mobile-probe applications.

    Main Methods:

    • Implemented a coherence-length isolation scheme allowing collinear propagation of sample and reference light within the probe.
    • Ensured path difference exceeds source coherence length to prevent premature interference.
    • Utilized proximal beam splitting and optical-path-difference compensation for interference.
    • Integrated the scheme into a 10-MHz ultra-high-speed swept-source OCT system.

    Main Results:

    • Achieved an 11.2-dB signal-to-noise ratio enhancement compared to non-balanced configurations.
    • Effectively eliminated autocorrelation artifacts.
    • Demonstrated superior axial and phase stability under fiber disturbance compared to non-common-path architectures.

    Conclusions:

    • The proposed coherence-length isolation scheme successfully combines common-path OCT stability with balanced detection performance.
    • This approach provides a robust solution for high-quality, stable OCT imaging in mobile-probe scenarios.
    • Enables advanced OCT applications requiring motion resilience and high signal fidelity.