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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Coherence Theory

    Background:

    • Spatial coherence measurements are crucial for understanding light field properties.
    • Conventional wavefront folding interferometers (WFIs) often rely on prisms, leading to obstructions and polarization issues.
    • The Schell model, a common assumption, does not apply to all non-uniformly correlated fields.

    Purpose of the Study:

    • To present modified scanning-type WFIs capable of measuring spatial coherence in non-uniformly correlated fields.
    • To introduce a novel three-mirror WFI setup as an alternative to prism-based designs.
    • To demonstrate the system's ability to measure fields deviating from the Schell model.

    Main Methods:

    • Development of modified scanning-type wavefront folding interferometers (WFIs).
    • Implementation of a novel three-mirror WFI configuration avoiding prism-based obstructions.
    • Experimental validation using fields that do not adhere to the Schell model.
    • Comparison with results from a digital micromirror device-based Young's interferometer.

    Main Results:

    • The modified WFIs successfully measure spatial coherence for non-uniformly correlated fields.
    • The three-mirror WFI setup demonstrates robustness against polarization effects and avoids corner obstructions.
    • Experimental data confirm the capability to analyze fields beyond the Schell model's limitations.
    • Results show good agreement when compared to a digital micromirror device-based Young's interferometer.

    Conclusions:

    • Modified WFIs, particularly the three-mirror design, provide a robust and accurate method for spatial coherence measurements.
    • This approach extends coherence analysis to complex light fields not described by the Schell model.
    • The novel WFI design offers practical advantages over conventional prism-based interferometers.