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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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    Measuring spatial coherence is challenging. This study introduces a self-referencing holography method to fully characterize the mutual coherence function (MCF) of partially coherent beams, enabling advanced imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Coherence Theory
    • Holography

    Background:

    • Characterizing spatial coherence is complex due to the mutual coherence function (MCF) being a four-coordinate function.
    • This complexity hinders control and optimization of spatial coherence in critical applications.

    Purpose of the Study:

    • To develop an efficient and robust method for measuring the complete MCF of arbitrary partially coherent beams.
    • To demonstrate the application of this method in lensless diffractive imaging for phase object reconstruction.

    Main Methods:

    • Utilized self-referencing holography for MCF measurement.
    • No prior knowledge or assumptions about the MCF were required.
    • Applied the method to lensless diffractive imaging experiments.

    Main Results:

    • Successfully measured the complete MCF of partially coherent beams.
    • Experimentally reconstructed a phase object using the developed technique.
    • Demonstrated robust performance under spatially partially coherent illumination.

    Conclusions:

    • The proposed self-referencing holography scheme provides an efficient way to measure the complete MCF.
    • This technique is particularly valuable for short-wavelength imaging where coherence is limited and optics are scarce.
    • Enables advanced imaging capabilities for phase objects in challenging environments.