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Phase retrieval using a modified Shack-Hartmann wavefront sensor with defocus.

Changwei Li, Bangming Li, Sijiong Zhang

    Applied Optics
    |February 12, 2014
    PubMed
    Summary
    This summary is machine-generated.

    A modified Shack-Hartmann wavefront sensor offers sensitive and accurate phase retrieval by using a defocused detector. This novel approach shows excellent agreement with interferometer measurements for surface irregularity.

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    Area of Science:

    • Optics and Photonics
    • Wavefront Sensing and Metrology

    Background:

    • Shack-Hartmann wavefront sensors are standard for phase retrieval.
    • Conventional methods can have limitations in sensitivity and accuracy.

    Purpose of the Study:

    • To propose and validate a modified Shack-Hartmann sensor for enhanced phase retrieval.
    • To improve the sensitivity and accuracy of wavefront sensing.

    Main Methods:

    • A detector was placed at a defocused plane before the focal plane of the Shack-Hartmann sensor's lenslet array.
    • An optimization algorithm was used for phase retrieval, initialized with Zernike coefficients from conventional reconstruction.
    • Surface irregularity of a flat mirror was measured and compared to a Veeco interferometer.

    Main Results:

    • Numerical simulations demonstrated sensitive and accurate phase retrieval.
    • Experimental validation confirmed the sensor's feasibility.
    • Measurements of mirror surface irregularity showed very good agreement with interferometer data.

    Conclusions:

    • The modified Shack-Hartmann sensor provides a sensitive and accurate method for phase retrieval.
    • The proposed technique is experimentally validated and shows high correlation with established metrology tools.