Geometrical aberration of a generalized Wolter type I telescope

Details Geometrical aberration of a generalized Wolter type I telescope Geometrical aberration of a generalized Wolter type I telescope

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.4428n&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 26, Oct. 15, 1987, p. 4428-4432.

Physics

Optics

16

Aberration, Geometrical Optics, X Ray Telescopes, Cassegrain Optics, Pixels

Scientific paper

It is shown that spherical aberration and coma can be controlled by using two hyperboloids instead of the paraboloid-hyperboloid pair in the Wolter type I telescope. With this approach, the coma-free condition is satisfied only at a particular radius of the first mirror. An algorithm for determining the parameters of a pair of hyperboloids that has a given spherical aberration is presented. The best performance is achieved when the coma-free condition is allowed at the outer edge and about half of the defocused image for the largest height of an object is canceled by introducing spherical aberration.

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