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Stable complex conjugate artifact removal in OCT using circularly polarized light as reference.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Metrology

    Background:

    • Fourier domain optical coherence tomography (FDOCT) suffers from complex conjugate artifacts, mirroring depth profiles and limiting imaging range.
    • This artifact reduces sensitivity and compromises the optimal use of the ranging space in FDOCT systems.

    Purpose of the Study:

    • To present a new method for removing complex conjugate artifacts in FDOCT.
    • To improve imaging depth and sensitivity by overcoming the limitations of traditional FDOCT.

    Main Methods:

    • Utilized circularly polarized light as a reference to achieve quadrature detection of complex fringe data.
    • Employed passive broadband polarization optics for polarization control in reference and sample arms.
    • Used a balanced polarization diversity detection unit for simultaneous detection of phase-shifted fringes.

    Main Results:

    • Demonstrated a 40 dB artifact suppression ratio in a swept-source optical coherence tomography system.
    • The method proved immune to sample motion and laser phase noise.
    • Showcased successful in vivo imaging of human finger, non-human primate cornea, and retina.

    Conclusions:

    • The proposed method effectively removes complex conjugate artifacts in FDOCT.
    • This technique enhances imaging performance without imposing restrictions on source bandwidth, imaging speed, or computational power.
    • The method offers a significant advancement for various biomedical imaging applications.