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    Area of Science:

    • Optics
    • Nonlinear Optics
    • Biological Imaging

    Background:

    • Nonlinear spatial filters using second harmonic generation enable visible edge enhancement under invisible illumination.
    • Existing methods highlight edges isotropically, lacking directional control.
    • This limits applications in biological imaging where directional feature emphasis is crucial.

    Purpose of the Study:

    • To develop a vectorial nonlinear spatial filter for directional edge enhancement.
    • To enable selective visualization of sample features based on polarization control.
    • To address the limitations of isotropic edge highlighting in previous methods.

    Main Methods:

    • Utilizing two cascaded nonlinear crystals with orthogonal optical axes.
    • Implementing superposed nonlinear vortex filtering.
    • Controlling the polarization of invisible illumination to direct feature emphasis.

    Main Results:

    • Demonstrated directional edge highlighting of phase and intensity features.
    • Achieved visual emphasis of sample features in specific directions via polarization control.
    • Showcased the ability to use significantly weaker sample arm intensity (two orders of magnitude less) compared to the filter arm.

    Conclusions:

    • The vectorial nonlinear spatial filter offers directional control over edge enhancement.
    • This technique is promising for biological imaging and microscopy, especially with light-sensitive specimens.
    • Polarization control provides a novel method for visualizing and emphasizing directional contours in phase and intensity objects.