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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Time smear effects in spatial frequency multiplexed holography.

R G Racca, J M Dewey

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Spurious background fringes in time-resolved holography are caused by reference beam deflection during pulsed laser exposure. Understanding this time smear effect allows for parameter adjustments to minimize unwanted fringe formation.

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    Area of Science:

    • Optics and Photonics
    • Holographic Interferometry
    • Pulsed Laser Systems

    Background:

    • Time-resolved holography using pulsed lasers can exhibit spurious background fringes.
    • These fringes are linked to the rapid deflection of the reference beam during the exposure period.
    • The phenomenon is identified as a time smear effect caused by a changing angle of incidence.

    Purpose of the Study:

    • To theoretically analyze the formation of spurious background fringes in time-resolved holograms.
    • To derive equations describing the fringe formation due to reference beam deflection.
    • To establish methods for controlling exposure parameters to mitigate time smear effects.

    Main Methods:

    • Theoretical analysis of fringe formation in holography.
    • Derivation of mathematical equations to model the time smear effect.
    • Numerical and analytical solutions for realistic and simplified laser pulse profiles.

    Main Results:

    • Equations accurately describe the observed fringe formation.
    • A numerical solution was obtained for a realistic laser pulse time profile.
    • An analytical solution was derived using a simplified pulse profile model.

    Conclusions:

    • The study provides a theoretical framework for understanding spurious fringes in time-resolved holography.
    • Derived solutions enable the prediction and control of time smear effects.
    • Exposure parameters can be optimized to reduce unwanted fringe artifacts to acceptable levels.