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    A new iterative algorithm effectively eliminates ripple errors in dynamic interferometry caused by quarter-wave plate retardation. This improves measurement accuracy without manual adjustments.

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    Area of Science:

    • Optical Engineering
    • Metrology

    Background:

    • Dynamic interferometry is susceptible to retardation errors from quarter-wave plates (QWP).
    • These errors cause background intensity inconsistencies and modulation issues in phase-shifted interferograms.
    • This leads to periodic ripple errors in measurement results, reducing accuracy.

    Purpose of the Study:

    • To propose and validate an iterative algorithm for eliminating QWP retardation errors in dynamic interferometry.
    • To enhance the measurement accuracy of dynamic interferometers.

    Main Methods:

    • Development of a novel iterative algorithm to address ripple errors.
    • Validation through both computational simulations and experimental setups.

    Main Results:

    • The proposed algorithm effectively eliminates periodic ripple errors.
    • Stable and rapid convergence of the iterative process was observed.
    • Experimental results confirmed the algorithm's efficacy.

    Conclusions:

    • The iterative algorithm successfully corrects for QWP retardation errors.
    • It significantly improves the accuracy of dynamic interferometry measurements.
    • The method requires no additional manual intervention.