Monitoring Aspherization with a Spherometer

R. E. Parks; S. S. Lam; R. C. Crawford

doi:10.1364/OFT.1985.ThCC2

Optical Fabrication and Testing Workshop
Technical Digest Series (Optica Publishing Group, 1985),
paper ThCC2
•https://doi.org/10.1364/OFT.1985.ThCC2

Monitoring Aspherization with a Spherometer

R. E. Parks, S. S. Lam, and R. C. Crawford

Optical Fabrication and Testing 1985

Cherry Hill, New Jersey United States
12–13 June 1985
ISBN:

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Optical Testing (ThCC)

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R. E. Parks, S. S. Lam, and R. C. Crawford, "Monitoring Aspherization with a Spherometer," in Optical Fabrication and Testing Workshop, Technical Digest Series (Optica Publishing Group, 1985), paper ThCC2.

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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.

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