ASPHERO5 – Simulation and Analysis of Aspherical Polishing Process

Abstract:

ASPHERO5 is a funded German research project (project prime: Schneider OpticalMachines) with the goal of economic fabrication of high precision aspheres. The research is concentrated on the classical process chain consisting of grinding and polishing. The characterization of the incoming and outgoing surface quality is one issue to characterize the improvements. The variation of the local removal rate related to local curvature is one of the limiting factors of the polishing process. In this paper we report on first results characterizing the surface quality with a PSD (Power Spectral Density) algorithm and analyzing the local removal rates for the polishing step. In our research, two types of aspheres with 30 and 60 mm diameter were polished with a spinning tool process. The final deviation between simulation and experiment was less than 10 percent. That’s the starting point for further investigations within the project.

• Periodical: Key Engineering Materials (Volumes 364-366)
• Pages: 488-492
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.364-366.488
• Online since: December 2007
• Authors: Rainer Boerret, Andreas Kelm, Helge Thiess, Volkmar Giggel
• Keywords: Asphere, Optical Fabrication, Polishing, Power Spectral Density (PSD), Simulation

References

[1] H. Thiess, U. Birnbaum, R. Boerret, V. Giggel and M. Haag ASPHERO5: Advances in surface analysis, OSA Annual Meeting, Rochester, (2006).

DOI: 10.1364/oft.2006.oftua2

[2] Taylor-Hobson precision PGI, http: /www. taylor-hobson. com; Carl Zeiss UPMC 850, UPMC ultra Technische Daten und Leistungsmerkmale http: /www. zeiss. de/imt.

[3] R. Boerret, J. Burger, A. Bich, C. Gall, T. Hellmuth, "Research on fabrication of aspheres at the Center of Optics Technology (University of Applied Science in Aalen), SPIE Optifab 2005, Technical Digest Vol. TD03, 30-23 (2005).

DOI: 10.1117/12.606091

[4] R. Boerret, V. Giggel, H. Wang, ASPHERO5, Rapid fabrication of precise aspheres, SPIE EOD2005 Jena, Germany 12-16 September.

DOI: 10.1117/12.623327

[5] W. Rupp, Surface structure of fine ground surface, Opt. Eng. 15, 392-397 (1976).

[6] F.W. Preston, The theory and Design of Plate Glass Polishing Machines, J. Glass Tech. 11, 124 (1927).

[7] Information on www. zeiss. de/de/service/jen/home. nsf.

[8] D. Walker, D. Brooks, A. King, R. Freemann, R. Morton, G. McCavana, S-W. Kim, The Pressions Tooling for Polishing and Figuring Flat, Spherical and Aspheric Surfaces, Optics Express, Vol. 11, issue 8, 958-964 (2003).

DOI: 10.1364/oe.11.000958

[9] W. Kordonski, A. Shorey, M. Tricard, Precision Finishing with Magnetorheological (MR) Jet Technology, Tech. Digest of SPIE, Vol. TD03, 1-3 (2005).

DOI: 10.1117/12.605912