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Proceedings Paper

ITTT: a state-of-the-art ultralightweight all-Be telescope
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Paper Abstract

The Infrared Technology Testbed Telescope (1T1T) is a demonstration telescope meeting the needs of the SIRTF mission. It is a Ritchey-Cretien form designed for diffraction limited performance at 6.5 pm, at 5.5 K with an 85 cm. clear aperture. The mirror and system focal ratios are f/1.2 and f/12 respectively. This paper describes the design and fabrication of the efficient, ultra-lightweight, all-beryllium telescope. The design incorporates a central metering tower and single arch primary mirror to achieve a total telescope mass of less than 30 kg. Cryogenic testing of the primary mirror demonstrates the stability of the I-70-H (special) Be and the fabrication process. No thermal hysteresis was observed after repeated cycling to 5 K, and cryo-null figuring was utilized to overcome the small thermal instability observed at that temperature.

Paper Details

Date Published: 28 July 1997
PDF: 20 pages
Proc. SPIE 10289, Advanced Materials for Optics and Precision Structures: A Critical Review, 102890I (28 July 1997); doi: 10.1117/12.279810
Show Author Affiliations
Daniel R. Coulter, Jet Propulsion Lab. (United States)
Steven A. Macenka, Jet Propulsion Lab. (United States)
Mark T. Stier, Hughes Danbury Optical Systems, Inc. (United States)
Roger A. Paquin, Advanced Materials Consultant (United States)


Published in SPIE Proceedings Vol. 10289:
Advanced Materials for Optics and Precision Structures: A Critical Review
Mark A. Ealey; Roger A. Paquin; Thomas B. Parsonage, Editor(s)

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