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    Area of Science:

    • Biomedical optics
    • Optical imaging techniques
    • Advanced microscopy

    Background:

    • Full-field optical coherence tomography (FF-OCT) offers high-resolution en face imaging deep within tissues.
    • Specular reflections in FF-OCT can significantly degrade image contrast by overpowering backscattered signals.
    • Existing methods struggle to mitigate these strong, superficial reflections effectively.

    Purpose of the Study:

    • To develop and demonstrate a novel dark-field FF-OCT (d-FF-OCT) technique.
    • To suppress specular reflections and improve image contrast in FF-OCT.
    • To enhance the field-of-view (FOV) limitations caused by beam walk-off.

    Main Methods:

    • Implementation of an opaque disk in the pupil-conjugated plane to block specular reflections.
    • Replacement of the reference mirror with a blazed grating to eliminate sample-reference beam walk-off.
    • Utilizing d-FF-OCT for imaging and comparing results with conventional FF-OCT.

    Main Results:

    • Efficient suppression of specular reflections from the glass-specimen interface by at least two orders of magnitude.
    • Demonstration of significantly higher image contrast using d-FF-OCT compared to conventional FF-OCT.
    • Elimination of walk-off, potentially improving the imaging field-of-view.

    Conclusions:

    • Dark-field FF-OCT is a highly effective method for suppressing specular reflections.
    • The developed d-FF-OCT technique yields superior image contrast for deep tissue imaging.
    • This advancement holds promise for improved visualization in various biomedical applications.