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In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
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Alternative method for measuring phase retardation of birefringent elements.

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    This study introduces a new method for measuring phase retardation in birefringent materials using vortex modulation. The technique accurately determines phase retardation by analyzing interference patterns, achieving high precision.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Birefringent elements are crucial in optical systems.
    • Accurate measurement of phase retardation is essential for device characterization.

    Purpose of the Study:

    • To develop an alternative, precise method for measuring phase retardation.
    • To establish a linear relationship between phase retardation and fringe inclination.

    Main Methods:

    • Vortex modulation of orthogonally polarized beams.
    • Interference pattern analysis using image processing and centroid analysis.
    • Determining the inclination angle of the central dark fringe.

    Main Results:

    • A linear relationship was established between phase retardation and fringe inclination angle.
    • Phase retardation was accurately inferred from the fringe angle.
    • Measurement uncertainty of approximately 0.12° was achieved over a wide range (-180° to 180°).

    Conclusions:

    • The proposed vortex modulation method offers a feasible and accurate approach for phase retardation measurement.
    • This technique provides a valuable tool for optical metrology and birefringent material characterization.