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Transmission spheres are used to measure convex or concave spherical surfaces. The reference surface is a fused silica element with a surface irregularity peak-to-valley difference of λ/10 or smaller. These elements are housed and can be mounted to industry standard 101.6-mm-diameter bayonet fittings. Also offered are 50.8-mm diameter transmission spheres that permit a more economical means of testing spherical surfaces. They are designed to fit most commercially available interferometers, including the Zygo® 33 mm, although at a different f-number.
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