Mechanical Metrology System for Freeform Optics

Interferometry is a powerful methodology that is used widely for metrology measurements of telescope optics. It can be difficult or nearly impossible, however, to measure large convex optics (that do not have a real focal point), or complex-shaped optics, with an interferometer. Furthermore, interferometers require a large amount of space (comparable to the radius of curvature of the test mirror).

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