Paper 13100-148
Paper 13100-148
Modelling performance degradation of typical mid-spatial frequency errors in diamond-machined mirror arrays in the GMTIFS integral field unit
19 June 2024 • 17:30 - 19:00 Japan Standard Time | Room G5, North - 1F
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
Presenter
The Australian National Univ. (Australia)
Dr Andrew Kruse is an optical specialist at RSAA currently working on optical design for ground-based astronomy projects including the GMTIFS instrument. In 2016, Andrew got his bachelors degree in optical engineering at the University of Rochester Institute of Optics. He received his PhD in Electrical Engineering from the University of New South Wales Canberra in 2021 in the field of polarimetric imaging.