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Spatial coherence measurement via a digital micromirror device based spatiotemporal light modulation.

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    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Coherence Theory

    Background:

    • Measuring the spatial coherence of light is crucial in various optical applications.
    • Traditional methods often require complex setups and are sensitive to background light.
    • Digital micromirror devices (DMDs) offer dynamic control over optical wavefronts.

    Purpose of the Study:

    • To propose and validate a novel, robust method for measuring the spatial coherence of light.
    • To leverage the capabilities of digital micromirror devices for enhanced coherence measurements.
    • To develop a technique that is insensitive to background light and improves fringe visibility.

    Main Methods:

    • Utilizing temporal modulation of a double slit displayed on a digital micromirror device (DMD).
    • Theoretical analysis and experimental verification of the proposed technique.
    • Investigating the effect of modulating individual slits on interference fringe visibility.

    Main Results:

    • The proposed method is theoretically and experimentally demonstrated to be effective.
    • The technique exhibits general insensitivity to background light, eliminating the need for suppression or subtraction.
    • Modulating only one slit enhances the visibility of interference fringe patterns.

    Conclusions:

    • The developed method offers a convenient and accurate way to measure spatial coherence, especially for faint light sources.
    • The insensitivity to background light simplifies experimental procedures.
    • The ability to enhance fringe visibility further improves measurement accuracy and applicability.