J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
Highlights of EOSAM 2018
|Number of page(s)||9|
|Published online||02 August 2019|
Rigid aspheric smoothing tool for mid-spatial frequency errors on aspheric or freeform optical surfaces
National Facility for Ultra Precision Surfaces, OpTIC Centre, University of Huddersfield, St. Asaph Business Park, Ffordd William Morgan, LL17 0JD, St Asaph, North Wales, UK
2 Shanghai Institute of Optics and Fine Mechanics, The Chinese Academic of Science, Shanghai, China
3 Center for Precision Engineering, Harbin Institute of Technology, Harbin, China
4 Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, The Chinese Academic of Science, Changchun, China
5 Research Center for Space Optical Engineering, Harbin Institute of Technology, Harbin, China
6 Department of Physics and Astronomy, University College, Gower St, WC1E 6BT, London, UK
7 Zeeko Ltd, 4 Vulcan Court, Vulcan Way, Coalville, LE67 3FW, Leicestershire, UK
Accepted: 23 July 2019
In order to remove mid-spatial frequency errors on aspheric and freeform surfaces, we have developed an aspheric smoothing tool which, unusually, is rigid. This has been proved feasible in the special case where the abrasive grit size exceeds the aspheric misfit, providing a cushion. Firstly, experimental parameters were derived from simulation of Influence Functions regarding misfit between the tool and the surface, which leads to dynamic Influence functions. Then the experimental part was polished into an aspheric surface from generated spherical surface. Thirdly, the choice of tool’s shape parameters was completed with optimisation of conic constant and tilt angle. The tool was machined into aspheric shape with a single-point cutter. Finally, experiments were carried out to compare this tool with a standard spherical smoothing tool. The results showed that this aspheric smoothing tool can removal mid-spatial errors effectively on aspheric surfaces.
Key words: Mid-spatial frequency error / Freeform / Optical fabrication / Aspheric
© The Author(s) 2019
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