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Noncontact Metrology for Aspherical Lenses

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A new test method for aspherical lenses makes use of the precision and flexibility of a six-axis hexapod positioning stage.

JÜRGEN SCHWEIZER, MAHR GMBH, DORIS KNAUER AND STEFAN VORNDRAN, PHYSIK INSTRUMENTE (PI)

Freeform and aspheric optics have become popular because they provide better performance than traditional optics and can do so with fewer optical elements. The downside of the higher performance is increased complexity in design, manufacturing, and testing (Figure 1). For testing, noncontact interferometric methods that are based on a parallel-kinematic (hexapod) six- degree-of-freedom mechanism can position many types of optics in any orientation in space with submicron precision, with some methods achieving nanometer-level resolution. Compared to traditional, stacked, multiaxis positioning,...Read full article

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    Published: April 2020
    Glossary
    freeform optics
    Freeform optics refers to the design and fabrication of optical surfaces that do not follow traditional symmetric shapes, such as spheres or aspheres. Unlike standard optical components with symmetric and rotationally invariant surfaces, freeform optics feature non-rotationally symmetric and often complex surfaces. These surfaces can be tailored to meet specific optical requirements, offering greater flexibility in designing optical systems and achieving improved performance. Key points about...
    metrology
    Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement, including the development of measurement standards, techniques, and instruments, as well as the application of measurement principles in various fields. The primary objectives of metrology are to ensure accuracy, reliability, and consistency in measurements and to establish traceability to recognized standards. Metrology plays a crucial role in science, industry,...
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