Precision machining of strong aspheres made of calcium fluoride and fused silica

Olaf Schmelzer; Thomas Waak; Felix Lucas

doi:10.1117/12.2536669

15 November 2019 Precision machining of strong aspheres made of calcium fluoride and fused silica

Olaf Schmelzer, Thomas Waak, Felix Lucas

Proceedings Volume 11175, Optifab 2019; 111750H (2019) https://doi.org/10.1117/12.2536669
Event: SPIE Optifab, 2019, Rochester, New York, United States

Abstract

The publication describes the application of subaperture correction technologies for the fabrication of high-end aspheres and freeforms. In addition to the established processes grinding and polishing, technologies such as diamond turning and smoothing polishing to reduce mid-spatial frequency errors will be examined. The presentation focuses on the technology chain necessary for the production of high-precision aspherical components. The final correction of surface errors of optical components with the help of subaperture finishing tools MRF (magneto-rheological finishing) and IBF (ion beam finishing) will be described. Besides the increased demands on machining processes the accuracy of measuring procedures is becoming more and more important. “Pixel-precise” measuring is the basis for realization of higher demands. The impact of alignment errors (coma, spherical aberration, twist) on form accuracy is discussed. Results will be presented taken from the manufacturing of two strong aspheres.

Citation Download Citation

Olaf Schmelzer, Thomas Waak, and Felix Lucas "Precision machining of strong aspheres made of calcium fluoride and fused silica", Proc. SPIE 11175, Optifab 2019, 111750H (15 November 2019); https://doi.org/10.1117/12.2536669

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