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Holographic interferometry with multiple wavelengths.

T H Jeong, H I Bjelkhagen, L M Spoto

    Applied Optics
    |June 1, 1997
    PubMed
    Summary
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    Identifying zeroth-order fringes in holographic interferometry is simplified. Using multi-wavelength, full-color holography reveals these fringes as white, solving a long-standing challenge in displacement analysis.

    Area of Science:

    • Optics and Photonics
    • Interferometry
    • Holography

    Background:

    • Holographic interferometry is a technique used to measure small displacements.
    • Identifying zeroth-order fringes, indicating zero displacement, is challenging when locations are unknown.

    Purpose of the Study:

    • To provide a straightforward method for identifying zeroth-order fringes in holographic interferometry.
    • To address the unsolved problem of locating zero displacement fringes.

    Main Methods:

    • Recording double-exposure holograms of objects.
    • Utilizing full-color holography with three or more wavelengths.
    • Observing fringe color for identification.

    Main Results:

    Related Experiment Videos

  • Zeroth-order fringes are distinctly identified by their white color.
  • This method simplifies fringe analysis in holographic interferometry.
  • Successful identification of zero displacement fringes is achieved.

    • Conclusions:

    • The proposed method offers a simple and effective solution for identifying zeroth-order fringes.
    • Full-color, multi-wavelength holography enhances the practical application of holographic interferometry.
    • This technique resolves a key challenge in measuring displacements using holography.