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Aspheric grating for extreme ultraviolet astronomyA family of plane curves is developed which can diffract incident parallel rays to a point focus. These curves, termed diffractoidal curves, are rotated around an axis to produce surfaces of revolution correspondingly termed diffractoids, whose imaging properties for sources at infinity are studied by ray tracing in a few examples. The paraboloid emerges as a limiting case of the diffractoid. A comparison is made between the stigmatic focusing properties of the diffractoid and the toroidal grating.
Document ID
19780048723
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kastner, S. O.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wade, C., Jr.
(NASA Goddard Space Flight Center Laboratory for Astronomy and Astrophysics, Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
April 15, 1978
Publication Information
Publication: Applied Optics
Volume: 17
Subject Category
Astronomy
Accession Number
78A32632
Distribution Limits
Public
Copyright
Other

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