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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Coherent Imaging

    Background:

    • Optical intensity correlation enables spatial interference with incoherent light.
    • Broadband sources have limited spectral resolution due to short coherence times.
    • Existing methods struggle to achieve spectral-resolved measurements.

    Purpose of the Study:

    • To overcome spectral-resolved limitations in intensity correlation techniques.
    • To engineer a light source with enhanced spatial-spectral correlations.
    • To demonstrate multispectral ghost interference and spectral filtering.

    Main Methods:

    • Engineered a supercontinuum pseudothermal light source.
    • Utilized Hanbury Brown-Twiss (HBT) intensity interferometry.
    • Performed ghost interference experiments with the novel light source.

    Main Results:

    • Demonstrated pronounced spatial-spectral intensity correlations.
    • Achieved the first experimental multispectral ghost interference.
    • Generated polychromatic interference patterns via intensity correlation.
    • Showcased nondegenerate ghost interference and non-local spectral filtering.

    Conclusions:

    • The supercontinuum pseudothermal light source enables colorful interference patterns.
    • This method overcomes spectral resolution limits for incoherent light.
    • The source offers potential for spatial-spectral random encoding and correlation hyperspectral imaging.