Analysis of mid-spatial frequency errors in two dimensions at metal mirror fabrication

Tom Lammers; Matthias Beier; Johannes Hartung; Herbert Gross

doi:10.1117/12.2536774

15 November 2019 Analysis of mid-spatial frequency errors in two dimensions at metal mirror fabrication

Tom Lammers, Matthias Beier, Johannes Hartung, Herbert Gross

Proceedings Volume 11175, Optifab 2019; 111751E (2019) https://doi.org/10.1117/12.2536774
Event: SPIE Optifab, 2019, Rochester, New York, United States

Abstract

The wish for smaller and lighter telescopes, better image quality, and shorter wavelength applications sets ever increasing demands towards the quality of optical surfaces. In metal mirror fabrication with diamond turning, mid spatial frequency errors become the most limiting factor in achieving a certain surface quality, and reducing them puts high requirements on the manufacturing. A first step in improving the surface quality is to utilize appropriate analysis methods that account for the highly anisotropic surfaces developing at diamond turning. In this article, a novel, two-dimensional representation of the power spectral density is demonstrated, which takes up the many benefits of the established PSD and extends it to meet the demands of anisotropic surfaces.

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Citation Download Citation

Tom Lammers, Matthias Beier, Johannes Hartung, and Herbert Gross "Analysis of mid-spatial frequency errors in two dimensions at metal mirror fabrication", Proc. SPIE 11175, Optifab 2019, 111751E (15 November 2019); https://doi.org/10.1117/12.2536774

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