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COACH-based Shack-Hartmann wavefront sensor with an array of phase coded masks.

Nitin Dubey, Ravi Kumar, Joseph Rosen

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    A new Shack-Hartmann wavefront sensor (SHWS) uses coded phase masks and coded aperture correlation holography (COACH) for improved accuracy. This enhanced wavefront sensing method achieves a tenfold reduction in mean square wavefront error compared to traditional SHWS.

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    Area of Science:

    • Optics and Photonics
    • Wavefront Sensing Technology
    • Holography

    Background:

    • Shack-Hartmann wavefront sensors (SHWS) are crucial for measuring light beam wavefront shapes.
    • Accurate and sensitive wavefront sensing is essential for various optical applications.
    • Existing SHWS methods face limitations in measurement precision.

    Purpose of the Study:

    • To introduce a novel Shack-Hartmann wavefront sensor design.
    • To enhance measurement accuracy and sensitivity in wavefront sensing.
    • To demonstrate superior performance over conventional SHWS.

    Main Methods:

    • Replacing the traditional lenslet array with an array of coded phase masks.
    • Implementing coded aperture correlation holography (COACH) for wavefront reconstruction.
    • Utilizing sharper correlation peaks from COACH for improved slope estimation.

    Main Results:

    • The proposed COACH-based SHWS demonstrated significantly higher measurement accuracy.
    • Experimental results showed a mean square wavefront error reduced by one order of magnitude.
    • The method achieved more accurate estimation of local wavefront slopes.

    Conclusions:

    • The novel SHWS design utilizing coded phase masks and COACH offers superior wavefront sensing performance.
    • This advancement leads to a substantial improvement in wavefront reconstruction accuracy.
    • The findings suggest a promising new direction for high-precision optical metrology.