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Speckle-suppressed full-field imaging through a scattering medium using a supercontinuum.

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    Supercontinuum illumination suppresses speckle for clearer imaging through scattering media. This technique improves pattern identification, even in highly scattering conditions, with applications in fuel spray imaging.

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    Area of Science:

    • Optics and Photonics
    • Imaging Science

    Background:

    • Scattering media degrade image quality by introducing speckle.
    • Coherent illumination exacerbates speckle, hindering pattern visibility.

    Purpose of the Study:

    • To demonstrate speckle-suppressed full-field imaging through scattering media.
    • To evaluate the effectiveness of incoherent supercontinuum illumination for imaging.

    Main Methods:

    • Utilized incoherent supercontinuum (SC) illumination for full-field imaging.
    • Compared image quality and pattern identifiability with coherent laser illumination.
    • Tested imaging performance at high optical depths (up to 12.3).

    Main Results:

    • SC illumination significantly suppressed speckle compared to coherent laser light.
    • Patterns in SC-illuminated images were more easily identifiable.
    • Identifiable patterns were achieved even at an optical depth of 12.3.

    Conclusions:

    • Incoherent supercontinuum illumination is effective for speckle suppression in full-field imaging through scattering media.
    • The technique enhances pattern visibility and maintains identifiability in challenging scattering conditions.
    • Demonstrated potential application in imaging high-pressure diesel sprays.