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Holographic radius test plates for spherical surfaces with large radius of curvature



Quandou (. Wang, Ulf Griesmann, Johannes A. Soons


We describe a novel interferometric method, based on nested Fresnel zone lenses or photon sieves, for testing and measuring the radius of curvature of precision spherical surfaces that have radii in a range between several meters to few hundred meters. We illustrate the measurement concept with radius measurements of a spherical mirror with a nominal radius of 10m. The measured radius is 10104mm ± 6mm. Our measurements also demonstrate, for the first time, the utility of photon sieves for precision surface metrology because they diffuse higher diffraction orders of computer generated holograms and reduce coherent noise.
Applied Optics


interferometry, radius-of-curvature, computer generated hologram, photon sieve


Wang, Q. , Griesmann, U. and Soons, J. (2014), Holographic radius test plates for spherical surfaces with large radius of curvature, Applied Optics, [online], (Accessed July 23, 2024)


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Created July 8, 2014, Updated October 12, 2021