Lightweighted secondary mirror for the United Kingdom Infrared Telescope

Ralf-Rainer Rohloff; Eckhart Pitz; Timothy G. Hawarden; Nicholas P. Rees; Eli Ettedgui-Atad; Horst W. Kaufmann; Lutz Schmadel

doi:10.1117/12.367613

29 October 1999 Lightweighted secondary mirror for the United Kingdom Infrared Telescope

Ralf-Rainer Rohloff, Eckhart Pitz, Timothy G. Hawarden, Nicholas P. Rees, Eli Ettedgui-Atad, Horst W. Kaufmann, Lutz Schmadel

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Proceedings Volume 3785, Advanced Telescope Design, Fabrication, and Control; (1999) https://doi.org/10.1117/12.367613
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

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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); https://doi.org/10.1117/12.367613

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