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Proceedings Paper

Effect of cryocontaminants on cryogenic superpolished mirror and superpolished quartz crystal microbalance
Author(s): Bryan L. Seiber; Robert J. Bryson; Raymond P. Young; Bob E. Wood; Deidra A. Dykeman
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Paper Abstract

Many systems contain cryogenic optical systems that operate at temperatures where gases such as nitrogen, oxygen, carbon dioxide, and water will condense. This study presents experimental results of the effects of these gases condensed on highly polished (superpolished) mirror surfaces cooled to temperatures as low as 15 K under vacuum conditions. Using these gases as contaminants, the bidirectional reflectance distribution function was obtained at a wavelength of 0.6328 micron for various contaminant film thicknesses up to 8 microns. Most of the data were obtained using as the mirror surface the superpolished sense crystal of a previously developed quartz crystal microbalance (SPQCM). The SPQCM allowed the mass of the actual contaminant layer to be measured directly.

Paper Details

Date Published: 18 December 1992
PDF: 11 pages
Proc. SPIE 1754, Optical System Contamination: Effects, Measurement, Control III, (18 December 1992); doi: 10.1117/12.140734
Show Author Affiliations
Bryan L. Seiber, Calspan Corp. (United States)
Robert J. Bryson, Calspan Corp. (United States)
Raymond P. Young, Calspan Corp. (United States)
Bob E. Wood, Calspan Corp. (United States)
Deidra A. Dykeman, Rome Lab. (United States)

Published in SPIE Proceedings Vol. 1754:
Optical System Contamination: Effects, Measurement, Control III
A. Peter M. Glassford, Editor(s)

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