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Objective shearing digital holography for removing aberration from optical system.

Weiqing Pan, Kehan Tian, Chuhang Zhang

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    A novel digital holography method uses lateral shearing interference to eliminate optical aberrations. This technique reconstructs original sample phases, enhancing precision in ultra-precise optical measurements.

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    Area of Science:

    • Optical Physics
    • Metrology

    Background:

    • Aberrations in optical systems degrade measurement accuracy.
    • Digital holography offers advanced imaging but can be susceptible to aberrations.

    Purpose of the Study:

    • To introduce a digital holography technique that completely removes optical aberrations.
    • To enable ultra-precise optical measurements by eliminating phase aberrations.

    Main Methods:

    • Utilizing lateral shearing interference with three mutually shifted image holograms.
    • Obtaining phase differences from shifted holograms to reconstruct the original sample phase.
    • Analyzing the impact of stage imprecision on reconstruction quality.

    Main Results:

    • Demonstrated complete removal of phase aberrations through optical experiments.
    • Successfully reconstructed original sample phases by compensating for aberrations.
    • Verified the method's effectiveness in enhancing measurement accuracy.

    Conclusions:

    • The proposed digital holography method effectively eliminates optical phase aberrations.
    • This technique is suitable for ultra-precise optical measurement applications requiring high accuracy.