Abstract
During the aspherization of a 1.8 m diameter, f/2.7 paraboloidal mirror, we used a bar type, two ball spherometer to quantitatively monitor the surface figure both in the ground and polished states. Parallel tests with a knife edge showed that we could have used the spherometer right up to the point the mirror was ready for final figuring against a null lens. We discuss the spherometer design, its use and the reduction of the sag data.
© 1985 Optical Society of America
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