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Interferometer for precise and flexible asphere testing.

Eugenio Garbusi1, Christof Pruss, Wolfgang Osten

  • 1Institut fur Technische Optik, Universitat Stuttgart, Stuttgart, Germany. garbusi@ito.uni-stuttgart.de

Optics Letters
|December 17, 2008
PubMed
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A new non-null interferometer precisely measures aspheric surfaces rapidly using multiple test beams. This advanced optical testing system accurately characterizes strong aspheres, overcoming limitations of traditional methods.

Area of Science:

  • Optics and Optical Engineering
  • Metrology
  • Surface Characterization

Background:

  • Classical interferometers use a single test wavefront, limiting their efficiency for complex surfaces.
  • Precise measurement of aspheric surfaces is crucial in various optical applications.
  • Strong aspheres present significant challenges for traditional metrology techniques.

Purpose of the Study:

  • To present a novel non-null interferometer design for precise aspheric surface measurement.
  • To enable rapid characterization of aspheric optical components.
  • To address the limitations of classical interferometers in measuring surfaces with large deviations.

Main Methods:

  • Utilizing multiple test beams propagating at different angles within the interferometer.

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  • Implementing a non-null test configuration to accommodate strong aspheres.
  • Characterizing additional aberrations introduced by the novel interferometer system.

    • Main Results:

    • Demonstrated rapid measurement of aspheric surfaces.
    • Successfully measured strong aspheres with deviations up to 900 micrometers (microm).
    • Experimental validation of the calibrated non-null interferometer on a standard aspheric element.

    Conclusions:

    • The novel non-null interferometer offers a significant advancement in aspheric surface metrology.
    • The system provides a fast and accurate method for characterizing complex optical surfaces.
    • This approach is suitable for measuring strong aspheres with substantial deviations from spherical form.