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Method to obtain a clear fringe pattern with a zone-plate interferometer.

T Nomura, K Kamiya, H Miyashiro

    Applied Optics
    |November 2, 2010
    PubMed
    Summary

    A new fringe-intensity reversal technique using a modified zone plate eliminates the central bright spot in zone-plate interferometry. This method allows for complete fringe analysis without data loss, improving interference fringe analysis.

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    Area of Science:

    • Optics and optical measurement
    • Interferometry
    • Metrology

    Background:

    • Zone-plate interferometers produce a bright central spot that obstructs interference fringe analysis.
    • Existing methods like masking can lead to data loss, hindering complete fringe analysis.

    Purpose of the Study:

    • To propose a novel technique for efficient interference fringe analysis in zone-plate interferometry.
    • To eliminate the central bright spot without compromising fringe data.

    Main Methods:

    • A zone plate with a specific phase fraction (π/2 or 3π/2) was employed.
    • The technique is based on the principle of fringe-intensity reversal.
    • The method was experimentally validated by measuring the shape error of a concave mirror.

    Main Results:

    • The proposed technique effectively diminishes the central bright spot.
    • Complete fringe analysis was achieved, with no loss of fringe data.
    • Experimental results for concave mirror shape error measurement showed good agreement with a Fizeau interferometer.

    Conclusions:

    • The fringe-intensity reversal technique offers an efficient and complete method for analyzing interference fringes in zone-plate interferometry.
    • This approach overcomes the limitations of the central bright spot and data loss associated with other methods.
    • The technique is suitable for precise optical metrology applications, such as shape error measurement.