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    This study demonstrates detecting birefringence singularity in space-variant retarders using supercontinuum vector beams. This birefringence measurement method precisely tracks singularity point kinematics, validated by numerical calculations and experiments.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Space-variant retarders are crucial optical components with spatially varying birefringence.
    • Understanding and characterizing birefringence singularities is essential for advanced optical applications.
    • Supercontinuum vector beams offer unique properties for probing complex optical materials.

    Purpose of the Study:

    • To demonstrate the detection of birefringence singularity in space-variant retarders with inhomogeneous birefringence.
    • To utilize supercontinuum vector beam analysis for measuring birefringence and determining singularity point kinematics.
    • To validate the proposed method through numerical calculations and experimental verification.

    Main Methods:

    • Employing a supercontinuum vector beam to probe a space-variant retarder.
    • Analyzing the intensity profile of single-shot images at multiple wavelengths (450, 550, 650 nm).
    • Measuring retardance and azimuthal angle to characterize the birefringence singularity.

    Main Results:

    • Successfully detected birefringence singularity in space-variant retarders.
    • Birefringence measurements provided the kinematics of the singularity point.
    • Experimental results for retardance changes (e.g., 112° to 131° at 450 nm) closely matched numerical calculations based on singularity position (x0 displacement from 0 to 350 µm).

    Conclusions:

    • Supercontinuum vector beam analysis is an effective method for detecting and characterizing birefringence singularities.
    • The kinematics of singularity points can be accurately determined using this technique.
    • The findings validate the potential of this approach for analyzing complex optical materials with inhomogeneous birefringence.