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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 4 — Feb. 1, 2003
  • pp: 724–735

Thermal forming of glass microsheets for x-ray telescope mirror segments

Mario A. Jimenez-Garate, Charles J. Hailey, William W. Craig, and Finn E. Christensen  »View Author Affiliations


Applied Optics, Vol. 42, Issue 4, pp. 724-735 (2003)
http://dx.doi.org/10.1364/AO.42.000724


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Abstract

We describe a technology to mass-produce ultrathin mirror substrates for x-ray telescopes of near Wolter-I geometry. Thermal glass forming is a low-cost method to produce high-throughput, spaceborne x-ray mirrors for the 0.1–200-keV energy band. These substrates can provide the collecting area envisioned for future x-ray observatories. The glass microsheets are shaped into mirror segments at high temperature by use of a guiding mandrel, without polishing. We determine the physical properties and mechanisms that elucidate the formation process and that are crucial to improve surface quality. We develop a viscodynamic model for the glass strain as the forming proceeds to find the conditions for repeatability. Thermal forming preserves the x-ray reflectance and scattering properties of the raw glass. The imaging resolution is driven by a large wavelength figure. We discuss the sources of figure errors, and we calculate the relaxation time of surface ripples.

© 2003 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(220.4610) Optical design and fabrication : Optical fabrication
(340.0340) X-ray optics : X-ray optics
(340.7470) X-ray optics : X-ray mirrors
(350.1260) Other areas of optics : Astronomical optics
(350.6090) Other areas of optics : Space optics

History
Original Manuscript: June 6, 2002
Revised Manuscript: October 17, 2002
Published: February 1, 2003

Citation
Mario A. Jimenez-Garate, Charles J. Hailey, William W. Craig, and Finn E. Christensen, "Thermal forming of glass microsheets for x-ray telescope mirror segments," Appl. Opt. 42, 724-735 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-4-724

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