1 July 2002 Aspheric optics: smoothing the ripples with semi-flexible tools
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Optical Engineering, 41(7), (2002). doi:10.1117/1.1481898
Abstract
A well-known fabrication problem with aspheric optical surfaces lies in high-frequency surface irregularities inherent in the figuring process. Optical grinding and polishing tools can smooth these ripples, yet retain the flexibility required to fit the aspheric surface. An f/0.52, paraboloidal, 17-in. convex surface is produced with conventional rigid tools. A transmission ronchigram is obtained showing high- spatial-frequency errors of large magnitude. After four hours of grinding with a semi-flexible multiple-segment ring tool, almost all high-frequency error is removed. This shows good potential for smoothing finished aspheric optics. Flexible tools can also be involved in the figuring process itself.
Michael T. Tuell, James H. Burge, Bill Anderson, "Aspheric optics: smoothing the ripples with semi-flexible tools," Optical Engineering 41(7), (1 July 2002). http://dx.doi.org/10.1117/1.1481898
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KEYWORDS
Surface finishing

Aspheric lenses

Polishing

Spatial frequencies

Aspheric optics

Lens grinding

Feedback loops

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