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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 13 — May. 1, 2003
  • pp: 2415–2421

W/SiC x-ray multilayers optimized for use above 100 keV

David L. Windt, Soizik Donguy, Charles J. Hailey, Jason Koglin, Veijo Honkimaki, Eric Ziegler, Finn E. Christensen, Hubert Chen, Fiona A. Harrison, and William W. Craig  »View Author Affiliations


Applied Optics, Vol. 42, Issue 13, pp. 2415-2421 (2003)
http://dx.doi.org/10.1364/AO.42.002415


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Abstract

We have developed a new depth-graded multilayer system comprising W and SiC layers, suitable for use as hard x-ray reflective coatings operating in the energy range 100–200 keV. Grazing-incidence x-ray reflectance at E = 8 keV was used to characterize the interface widths, as well as the temporal and thermal stability in both periodic and depth-graded W/SiC structures, whereas synchrotron radiation was used to measure the hard x-ray reflectance of a depth-graded multilayer designed specifically for use in the range E∼150–170 keV. We have modeled the hard x-ray reflectance using newly derived optical constants, which we determined from reflectance versus incidence angle measurements also made using synchrotron radiation, in the range E = 120–180 keV. We describe our experimental investigation in detail, compare the new W/SiC multilayers with both W/Si and W/B4C films that have been studied previously, and discuss the significance of these results with regard to the eventual development of a hard x-ray nuclear line telescope.

© 2003 Optical Society of America

OCIS Codes
(230.4170) Optical devices : Multilayers
(310.6860) Thin films : Thin films, optical properties
(340.7470) X-ray optics : X-ray mirrors
(350.1260) Other areas of optics : Astronomical optics

History
Original Manuscript: August 11, 2002
Revised Manuscript: October 29, 2002
Published: May 1, 2003

Citation
David L. Windt, Soizik Donguy, Charles J. Hailey, Jason Koglin, Veijo Honkimaki, Eric Ziegler, Finn E. Christensen, Hubert Chen, Fiona A. Harrison, and William W. Craig, "W/SiC x-ray multilayers optimized for use above 100 keV," Appl. Opt. 42, 2415-2421 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-13-2415


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References

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  13. Glass substrates were provided by Wave Precision, Moorpark, Calif.
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  15. High-energy atomic scattering factors are available at http://www-phys.llnl.gov/Research/scattering/asf.html .
  16. High-energy mass absorption coefficients are available for elements at http://physics.nist.gov/PhysRefData/XrayMassCoef/cover.html . For compounds, see http://bnlnd2.dne.bnl.gov/ .
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  19. The optical constants that we derived here will be included with the next release of IMD, available at http://cletus.phys.columbia.edu/windt/imd .

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