Glancing incidence vs. multilayer coated normal incidence mirrors for EUV telescopes.

Details Glancing incidence vs. multilayer coated normal incidence mirrors for EUV telescopes. Glancing incidence vs. multilayer coated normal incidence mirrors for EUV telescopes.

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1160..286w&link_type=abstract

Conference on X-Ray/EUV Optics for Astronomy and Microscopy, p. 286 - 296

Physics

Optics

Telescopes: Extreme Uv, Mirrors: Coatings

Scientific paper

EUV telescopes are typically Wolter Type II telescopes, made with glancing incidence mirrors. Recent developments in multilayer coatings have opened up the possibility of using normal incidence mirrors in a Cassegrain configuration for EUV telescopes. Each of these approaches has advantages and disadvantages. Glancing incidence mirrors have a higher reflectivity with a broad bandwidth, but the surfaces are difficult to make. Normal incidence mirrors are easier to fabricate to the necessary surface requirements, but require coatings with acceptable reflectivity only in a narrow bandpass. The authors discuss the technical tradeoffs of using glancing incidence and normal incidence mirrors for EUV telescopes.

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