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29 October 1999 Lightweighted secondary mirror for the United Kingdom Infrared Telescope
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Abstract
The paper describes the manufacture and testing of a lightweighted Zerodur secondary mirror for the United Kingdom Infrared Telescope on Mauna Kea, Hawaii. The 313 mm diameter mirror is mounted on a Piezo platform for fast tip/tilt corrections. Therefore, the mirror mass has to be minimized to achieve high dynamic properties of the adaptive tip/tilt platform. The goal was to test the convex secondary without large auxiliary optics (Hindle sphere). We measured the mirror through the back surface using a small null lens system. A special transparent and highly homogeneous Zerodur was used for this purpose. We demonstrate that grinding a honeycomb structure and acid-etching of the back side of the mirror does not affect the figure of the polished convex surface.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ralf-Rainer Rohloff, Eckhart Pitz, Timothy G. Hawarden, Nicholas P. Rees, Eli Ettedgui-Atad, Horst W. Kaufmann, and Lutz Schmadel "Lightweighted secondary mirror for the United Kingdom Infrared Telescope", Proc. SPIE 3785, Advanced Telescope Design, Fabrication, and Control, (29 October 1999); doi: 10.1117/12.367613; https://doi.org/10.1117/12.367613
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