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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 1 — Jan. 1, 2001
  • pp: 136–144

Grazing-incidence hyperboloid–hyperboloid designs for wide-field x-ray imaging applications

James E. Harvey, Andrey Krywonos, Patrick L. Thompson, and Timo T. Saha  »View Author Affiliations


Applied Optics, Vol. 40, Issue 1, pp. 136-144 (2001)
http://dx.doi.org/10.1364/AO.40.000136


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Abstract

The classical Wolter type I grazing-incidence x-ray telescope consists of a paraboloidal primary mirror and a confocal hyperboloidal secondary mirror. This design exhibits stigmatic imaging on-axis but suffers from coma, astigmatism, field curvature, and higher-order aberrations such as oblique spherical aberration. Wolter–Schwarzschild designs have been developed that strictly satisfy the Abbe sine condition and thus exhibit no spherical aberration or coma. However, for wide-field applications such as the solar x-ray imager (SXI), there is little merit in a design with stigmatic imaging on-axis. Instead, one needs to optimize some area-weighted-average measure of resolution over the desired operational field of view. This has traditionally been accomplished by mere despacing of the focal plane of the classical Wolter type I telescope. Here we present and evaluate in detail a family of hyperboloid–hyperboloid grazing-incidence x-ray telescope designs whose wide-field performance is much improved over that of an optimally despaced Wolter type I and even somewhat improved over that of an optimally despaced Wolter–Schwarzschild design.

© 2001 Optical Society of America

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(220.2740) Optical design and fabrication : Geometric optical design
(340.7440) X-ray optics : X-ray imaging
(340.7470) X-ray optics : X-ray mirrors

History
Original Manuscript: May 26, 2000
Revised Manuscript: September 9, 2000
Published: January 1, 2001

Citation
James E. Harvey, Andrey Krywonos, Patrick L. Thompson, and Timo T. Saha, "Grazing-incidence hyperboloid–hyperboloid designs for wide-field x-ray imaging applications," Appl. Opt. 40, 136-144 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-1-136


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