Modelling performance degradation of typical mid-spatial frequency errors in diamond-machined mirror arrays in the GMTIFS integral field unit

Andrew W. Kruse; Israel J. Vaughn; Oleksandra Rebrysh; Davide Greggio; Rob Sharp

doi:10.1117/12.3019522

26 August 2024 Modelling performance degradation of typical mid-spatial frequency errors in diamond-machined mirror arrays in the GMTIFS integral field unit

Andrew W. Kruse, Israel J. Vaughn, Oleksandra Rebrysh, Davide Greggio, Rob Sharp

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310041 (2024) https://doi.org/10.1117/12.3019522
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The optical design of the GMTIFS integral field unit includes several mirror arrays that are proposed to be diamond machined, including the pupil and field mirror arrays as well as the image slicer. The fabrication process of diamond machined surfaces often leaves behind tool marks at mid-spatial frequencies which can have significant impact on optical performance that is not fully accounted for by errors in high-spatial frequency (surface roughness) or low-spatial frequency (form error). The structure and form of these mid-spatial frequencies is dependent on the specific machining and polishing techniques used in the fabrication of the optical elements. In this study, we model and implement representative surfaces in ray tracing software to characterise the effects of mid-spatial frequency errors on the mirror arrays in the GMTIFS spectrograph.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Andrew W. Kruse, Israel J. Vaughn, Oleksandra Rebrysh, Davide Greggio, and Rob Sharp "Modelling performance degradation of typical mid-spatial frequency errors in diamond-machined mirror arrays in the GMTIFS integral field unit", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310041 (26 August 2024); https://doi.org/10.1117/12.3019522

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