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    Area of Science:

    • Biomedical optics
    • Optical imaging
    • Metrology

    Background:

    • Optical coherence tomography (OCT) provides micrometer-resolution cross-sectional imaging.
    • Phase-sensitive detection in OCT enables sensing of minute physical changes.
    • Expanding light source bandwidth improves OCT axial resolution, but discontinuous bandwidth creates sidelobes.

    Purpose of the Study:

    • To develop a method for achieving high axial resolution in OCT despite discontinuous bandwidth.
    • To address the issue of abnormal sidelobes caused by wavelength gaps in OCT signal estimation.

    Main Methods:

    • A real-valued iterative adaptive approach (RIAA) was developed.
    • A weighted matrix was employed within RIAA to suppress sidelobes.
    • OCT signals were estimated and analyzed using RIAA and other methods.

    Main Results:

    • RIAA demonstrated superior suppression of abnormal sidelobes compared to other methods.
    • The method achieved high axial resolution under discontinuous bandwidth conditions.
    • Validation using a single-reflector OCT spectrum confirmed RIAA's effectiveness.

    Conclusions:

    • The RIAA method effectively mitigates sidelobes caused by wavelength gaps in OCT.
    • This approach enables high-resolution OCT measurements even with discontinuous bandwidth.
    • The practical value of RIAA was validated through imaging of various samples.