Poster + Presentation + Paper
13 December 2020 Polishing and testing of TMT reference sphere
Dijana Bogunovic, Graeme Jonas, Dave Cochrane, Sripadmanaban Sriram, G. C. Anupama
Author Affiliations +
Conference Poster
Abstract
The Thirty Meter Telescope (TMT) is a joint venture of scientific institutions in Canada, China, India, Japan and the United States to build a 30 m diameter Ritchey-Chretien optical-infrared telescope. The large aperture size and field of view, with its adaptive optics (AO) systems will enable imaging at the diffraction limit, precision astrometry, high contrast imaging and spectroscopy from the ultraviolet through the mid-infrared. Its 30 m primary mirror consists of 492 off-axis aspheric segmented hexagonal mirrors, each having a diameter of 1.44 m across corners. The manufacture of the segments is distributed amongst India, USA, China and Japan. KiwiStar Optics (business unit of Callaghan Innovation), New Zealand manufactured a reference sphere for India TMT Co-Ordination Centre (ITCC). This paper presents polishing, testing procedures and metrology challenges of a 61.7 m long radius of curvature reference sphere. The radius of curvature and surface figure interferometric testing error budget is discussed in detail.
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dijana Bogunovic, Graeme Jonas, Dave Cochrane, Sripadmanaban Sriram, and G. C. Anupama "Polishing and testing of TMT reference sphere", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 1145130 (13 December 2020); https://doi.org/10.1117/12.2561910
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KEYWORDS
Thirty Meter Telescope

Optical spheres

Polishing

Adaptive optics

Imaging spectroscopy

Imaging systems

Mirrors

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