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Proceedings Paper

Diamond-turned lightweight athermal visible TMA telescope for the planned New Horizons Mission to Pluto
Author(s): M. J. Hegge; J. W. Baer; L. M. R. Hardaway; G. Taudien; D. S. Sabatke; S. R. Shidemantle; J. J. Santman; L. E. Comstock
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Paper Abstract

Unpolished diamond turned mirrors are common for infrared systems. We report the successful use of unpolished mirrors in a visible spectrum, all aluminum telescope for the planned New Horizons mission to Pluto. The Ralph telescope is an F/8.7 Three Mirror Anastigmat with a 75mm aperture, a 5.7° by 1.0° field of view, and a mass of only 8kg. Key to the performance of the system are a process for reducing the micro-roughness of the off-axis aspheric surfaces to below 60 Ångstroms RMS, and the fabrication of precision diamond turned mounting features on the mirrors and one-piece, thin-walled housing. The telescope achieves nearly diffraction-limited performance with minimal post-assembly alignment, and maintains that performance, including focus, over a wide range about the operating temperature of 210K.

Paper Details

Date Published: 30 August 2005
PDF: 9 pages
Proc. SPIE 5877, Optomechanics 2005, 58770K (30 August 2005);
Show Author Affiliations
M. J. Hegge, Ball Aerospace & Technologies Corp. (United States)
J. W. Baer, Ball Aerospace & Technologies Corp. (United States)
L. M. R. Hardaway, Ball Aerospace & Technologies Corp. (United States)
G. Taudien, Ball Aerospace & Technologies Corp. (United States)
D. S. Sabatke, Ball Aerospace & Technologies Corp. (United States)
S. R. Shidemantle, Ball Aerospace & Technologies Corp. (United States)
J. J. Santman, Corning NetOptix Diamond Turning Division (United States)
L. E. Comstock, Corning NetOptix Diamond Turning Division (United States)


Published in SPIE Proceedings Vol. 5877:
Optomechanics 2005
Alson E. Hatheway, Editor(s)

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