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    Area of Science:

    • Optical Imaging
    • Tomography
    • Microscopy

    Background:

    • Advanced microscopy techniques have overcome spatial diffraction limits, particularly in fluorescence imaging.
    • Depth-imaging tomography, especially in optical coherence tomography (OCT), faces limitations in imaging quality due to Fourier bandwidth constraints.
    • Space-time duality offers a potential avenue for enhancing tomographic imaging capabilities.

    Purpose of the Study:

    • To explore the analogy between spatial microscopy and temporal tomography using space-time duality.
    • To demonstrate an all-optical method for improving the point-spread function (PSF) in swept-source OCT.
    • To enhance the overall imaging quality in depth-imaging tomography.

    Main Methods:

    • Investigated the space-time duality principle to bridge spatial and temporal imaging concepts.
    • Implemented all-optical manipulation of the point-spread function (PSF) in swept-source OCT.
    • Utilized temporal phase modulation for PSF engineering in OCT.

    Main Results:

    • Achieved sharper specimen imaging through manipulation of the PSF.
    • Maintained axial resolving power while improving image clarity.
    • Demonstrated enhanced imaging quality with suppressed ghost fringes and improved sensitivity in OCT.

    Conclusions:

    • The application of space-time duality provides a novel approach to advance tomography.
    • Temporal phase modulation is an effective all-optical method for enhancing OCT imaging quality.
    • This work offers a pathway to overcome current limitations in depth-imaging tomography.