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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 16 — Jun. 1, 2007
  • pp: 3156–3163

Atomic force microscopy characterization of Zerodur mirror substrates for the extreme ultraviolet telescopes aboard NASA's Solar Dynamics Observatory

Regina Soufli, Sherry L. Baker, David L. Windt, Eric M. Gullikson, Jeff C. Robinson, William A. Podgorski, and Leon Golub  »View Author Affiliations


Applied Optics, Vol. 46, Issue 16, pp. 3156-3163 (2007)
http://dx.doi.org/10.1364/AO.46.003156


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Abstract

The high-spatial frequency roughness of a mirror operating at extreme ultraviolet (EUV) wavelengths is crucial for the reflective performance and is subject to very stringent specifications. To understand and predict mirror performance, precision metrology is required for measuring the surface roughness. Zerodur mirror substrates made by two different polishing vendors for a suite of EUV telescopes for solar physics were characterized by atomic force microscopy (AFM). The AFM measurements revealed features in the topography of each substrate that are associated with specific polishing techniques. Theoretical predictions of the mirror performance based on the AFM-measured high-spatial-frequency roughness are in good agreement with EUV reflectance measurements of the mirrors after multilayer coating.

© 2007 Optical Society of America

OCIS Codes
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(310.6860) Thin films : Thin films, optical properties
(340.7470) X-ray optics : X-ray mirrors

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: December 19, 2006
Manuscript Accepted: February 7, 2007
Published: May 15, 2007

Citation
Regina Soufli, Sherry L. Baker, David L. Windt, Eric M. Gullikson, Jeff C. Robinson, William A. Podgorski, and Leon Golub, "Atomic force microscopy characterization of Zerodur mirror substrates for the extreme ultraviolet telescopes aboard NASA's Solar Dynamics Observatory," Appl. Opt. 46, 3156-3163 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-16-3156


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References

  1. For more information see the official SDO site at http://sdo.gsfc.nasa.gov/ and AIA sites at http://hea-www.harvard.edu/AIA/ and http://aia.lmsal.com/.
  2. R. Soufli, D. L. Windt, J. C. Robinson, E. A. Spiller, F. J. Dollar, A. L. Aquila, E. M. Gullikson, B. Kjornrattanawanich, J. F. Seely, and L. Golub, "Development and testing of EUV multilayer coatings for the atmospheric imaging assembly instrument aboard the Solar Dynamics Observatory," in Solar Physics and Space Weather Instrumentation, S. Fineschi and R. A. Viereck, eds., Proc. SPIE 5901, 59010M (2005).
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  7. A complete discussion of the EUV multilayer coatings and performance of all flight mirrors/wavelengths of the AIA instrument is beyond the scope of this manuscript and will be given in a future publication.
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