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Digital holographic metrology based on multi-angle interferometry.

Jun Dong, Chao Jiang, Shuhai Jia

    Optics Letters
    |September 16, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a multi-angle interferometry technique for digital holographic metrology. The method achieves effective three-dimensional (3D) reconstruction, even for objects with complex surfaces, using a novel phase-based depth scanning algorithm.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Digital Holography

    Background:

    • Digital holographic metrology is crucial for precise 3D surface profiling.
    • Phase unwrapping challenges limit 3D reconstruction accuracy for objects with discontinuities.
    • Existing methods may struggle with wavelength-dependent reflectivity or chromatic aberrations.

    Purpose of the Study:

    • To develop a robust multi-angle interferometry method for digital holographic metrology.
    • To enable accurate three-dimensional (3D) reconstruction of objects, including those with large depth discontinuities.
    • To provide a method that is compatible with objects exhibiting wavelength-dependent reflectivity and free from chromatic aberrations.

    Main Methods:

    • Recording holograms at multiple, regularly incremented illumination angles using an electronically controlled rotating stage.
    • Employing a Fourier-transform-based axial depth scanning algorithm utilizing reconstructed phase information.
    • Utilizing a single-wavelength monochrome light source for illumination.

    Main Results:

    • Successful point-by-point height acquisition across the entire field of view.
    • Effective 3D reconstruction achieved, overcoming phase unwrapping limitations for complex surfaces.
    • Demonstrated applicability to objects with wavelength-dependent reflectivity without introducing chromatic aberrations.

    Conclusions:

    • The proposed multi-angle interferometry method offers an effective solution for digital holographic metrology.
    • This technique enhances the accuracy and robustness of 3D reconstruction, particularly for challenging object topographies.
    • The use of a monochrome source broadens the applicability of the method to a wider range of materials and optical conditions.