Lightweighted secondary mirror for the United Kingdom Infrared Telescope

Details Lightweighted secondary mirror for the United Kingdom Infrared Telescope Lightweighted secondary mirror for the United Kingdom Infrared Telescope

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3785..152r&link_type=abstract

Proc. SPIE Vol. 3785, p. 152-159, Advanced Telescope Design, Fabrication, and Control, William Roybal; Ed.

Physics

Optics

Scientific paper

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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