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Proceedings Paper

Determination of absolute change in optical power of a reference mirror at cryogenic temperature
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Paper Abstract

We have recently demonstrated the ability to measure the absolute change in optical power (focus) of a 152 mm diameter flat mirror in vacuum between room and cryogenic temperatures (133K) with a peak-to-valley measurement error of only 22nm. Such a measurement would be crucial to the verification of the focus of a cryogenic instrument during ground testing. The testing utilized a vibration-insensitive interferometer and a reference mirror maintained at room temperature located within the thermal vacuum chamber. Special considerations were taken to ensure that the reference mirror experienced low axial thermal gradients, since structural modeling indicated that axial thermal gradients and axial variation of substrate coefficient of thermal expansion are critical in maintaining flatness under cryogenic test conditions. This paper will discuss the testing equipment and methodology and the corresponding analysis and results.

Paper Details

Date Published: 14 August 2006
PDF: 9 pages
Proc. SPIE 6293, Interferometry XIII: Applications, 62930H (14 August 2006); doi: 10.1117/12.675341
Show Author Affiliations
Ian B. Murray, Ball Aerospace & Technologies, Corp. (United States)
Derek S. Sabatke, Ball Aerospace & Technologies, Corp. (United States)
Phillip C. Quigley, Ball Aerospace & Technologies, Corp. (United States)
Timothy Reed, Ball Aerospace & Technologies, Corp. (United States)
Peter T. Spuhler, Ball Aerospace & Technologies, Corp. (United States)
James W. Baer, Ball Aerospace & Technologies, Corp. (United States)
Jacobus M. Oschmann, Ball Aerospace & Technologies, Corp. (United States)


Published in SPIE Proceedings Vol. 6293:
Interferometry XIII: Applications
Erik L. Novak; Wolfgang Osten; Christophe Gorecki, Editor(s)

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