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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Coherence measurement with digital micromirror device.

Henri Partanen, Jari Turunen, Jani Tervo

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    This summary is machine-generated.

    This study uses a digital micromirror device to measure laser diode coherence, accurately predicting beam propagation and details. It also determines the necessary measurement points for precise beam modeling.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Characterizing the spatial coherence of multimode lasers is crucial for understanding and predicting beam propagation.
    • Traditional methods for coherence measurement can be complex and time-consuming.

    Purpose of the Study:

    • To measure the complex-valued spatial coherence function of a multimode broad-area laser diode.
    • To construct the coherent modes of the laser beam.
    • To simulate beam propagation and assess the accuracy of the measurement technique.

    Main Methods:

    • Utilized Young's double-slit experiment, implemented with a digital micromirror device (DMD).
    • Measured the complex-valued spatial coherence function.
    • Constructed coherent modes from the measured data.

    Main Results:

    • Excellent correspondence between simulated and directly measured intensity profiles was achieved.
    • The method accurately predicted even fine details of the laser beam.
    • The study investigated the number of measurement points needed for accurate beam modeling.

    Conclusions:

    • The DMD-based double-slit experiment provides an effective method for characterizing laser diode spatial coherence.
    • This technique allows for accurate prediction of beam propagation and detailed beam structure.
    • The findings offer insights into optimizing measurement strategies for laser beam characterization.