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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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Passive optical module for polarization-sensitive optical coherence tomography systems.

Sylvain Rivet, Manuel J Marques, Adrian Bradu

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    Summary
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    This study introduces a novel polarization-sensitive optical coherence tomography (PS-OCT) system. The system simplifies measurements of birefringence in samples without complex calibration or detectors.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Coherence Tomography

    Background:

    • Optical coherence tomography (OCT) is a valuable imaging modality.
    • Characterizing sample birefringence is crucial for various applications.
    • Existing polarization-sensitive OCT (PS-OCT) systems often require complex calibration and detection schemes.

    Purpose of the Study:

    • To develop and demonstrate a proof-of-concept polarization-sensitive swept source OCT system.
    • To measure retardance and axis orientation of linear birefringent samples.
    • To simplify PS-OCT implementation by eliminating calibration and specialized detectors.

    Main Methods:

    • A single input state polarization-sensitive OCT system was designed.
    • An optical module utilizing passive elements (two beam displacers, one Faraday rotator) was employed.
    • Simultaneous measurement of two polarization properties was achieved.

    Main Results:

    • The system successfully performed measurements of retardance and axis orientation.
    • The implementation does not require fiber polarimetric effect calibration.
    • A balanced polarization-diversity detector is not needed for operation.

    Conclusions:

    • The developed PS-OCT system offers a simplified approach to birefringence measurement.
    • The system's reliance on passive optical elements and simultaneous measurements enhances practicality.
    • This technology has potential for improved polarimetric imaging in various fields.