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Diffractive grazing-incidence interferometer.

P de Groot1

  • 1Department of Research and Development, Zygo Corporation, 21 Laurel Brook Road, Middlefield, Connecticut 06455, USA. peterd@zygo.com

Applied Optics
|March 18, 2008
PubMed
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A new symmetric geometry for grazing-incidence interferometry uses diffraction gratings for precise flat surface measurements. This method achieves 20 nm repeatability, suitable for testing various materials in production environments.

Area of Science:

  • Optical metrology
  • Surface characterization
  • Precision engineering

Background:

  • Grazing-incidence interferometry is crucial for characterizing flat surfaces.
  • Existing methods may face limitations in accuracy, working distance, or field of view.
  • Diffraction gratings offer potential for advanced beam manipulation in interferometric systems.

Purpose of the Study:

  • To introduce a novel symmetric geometry for grazing-incidence interferometry.
  • To enhance measurement accuracy and suitability for production testing of flat surfaces.
  • To leverage diffraction gratings for beam splitting and recombination.

Main Methods:

  • Development of a symmetric interferometric geometry.
  • Utilizing diffraction gratings for beam splitting and recombination.

Related Experiment Videos

  • Incorporating a reference mirror to correct wavefront inversion.
  • Testing with a 4-microm equivalent-wavelength system.

    • Main Results:

    • Achieved 3 sigma repeatability of 20 nm.
    • Demonstrated performance on both smooth and rough surfaces.
    • Validated on precision-engineered metal, ceramic, and glass objects.
    • System offers a comfortable working distance and large field of view.

    Conclusions:

    • The proposed symmetric geometry is effective for precise flat surface metrology.
    • The system's performance is suitable for demanding production testing applications.
    • Diffraction grating-based interferometry provides a viable approach for surface characterization.