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Updated: Jun 18, 2025

High-Accuracy Correction of 3D Chromatic Shifts in the Age of Super-Resolution Biological Imaging Using Chromagnon
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Dispersion mismatch correction for evident chromatic anomaly in low coherence interferometry.

Rishyashring R Iyer, Lingxiao Yang, Janet E Sorrells

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    Ultrafast supercontinuum sources in optical coherence tomography cause chromatic anomalies, degrading image resolution. A new method, DISCOTECA, offers optical, optoelectronic, and computational solutions for artifact-free biomedical imaging.

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    Area of Science:

    • Biomedical Optics
    • Ultrafast Laser Technology
    • Optical Coherence Tomography

    Background:

    • Biomedical microscopy increasingly utilizes interferometric techniques like optical coherence tomography and microscopy (OCT/OCM).
    • Transition from broadband sources to ultrafast supercontinuum sources in OCT/OCM has enabled ultra-high resolution imaging.
    • Dispersion anomalies in interferometers using ultrafast sources degrade axial resolution and introduce artifacts.

    Purpose of the Study:

    • To investigate chromatic anomalies in dispersion profiles of ultrafast pulses within Michelson interferometers.
    • To introduce DISpersion COmpensation Techniques for Evident Chromatic Anomalies (DISCOTECA) as a solution.
    • To demonstrate artifact-free OCT image reconstruction for biomedical applications.

    Main Methods:

    • Demonstration of artifact origins via self-phase modulation of ultrafast pulses.
    • Presentation of three DISCOTECA solution paradigms: optical, optoelectronic, and computational.
    • Piecewise reconstruction of phase mismatch using a modified short-term Fourier transform algorithm.

    Main Results:

    • Identified chromatic anomalies exceeding standard dispersion orders in long, non-identical interferometer arms.
    • Quantitatively compared DISCOTECA solutions against traditional methods, showing improved dynamic range and axial profiles.
    • Achieved artifact-free OCT image reconstruction using ultrafast supercontinuum sources.

    Conclusions:

    • DISCOTECA provides a universal solution for chromatic dispersion mismatch in interferometry, particularly with ultrafast sources.
    • The developed methods significantly improve axial resolution and eliminate fringe artifacts in OCT/OCM.
    • A decision-making guide is presented for implementing DISCOTECA in biomedical OCT applications.