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Aspheric concave grating spectrographsThe design of aspheric concave gratings for high-resolution spectroscopes is examined theoretically, using the requirements of the proposed Far-UV Spectroscopic Explorer (effective area 100 sq cm and lambda/delta lambda = 30,000 in the 90-120-nm range) as a concrete example and taking the limitations of current fabrication technology (straight grooves only and maximum density 6000 lines/mm) into account. The total-path function derived by Namioka (1961) for an ellipsoidal grating is subjected to aberration analysis to obtain the optical surface best suited to the design requirements; expressions for corrections to the conventional stigmatic Rowland-circle mount are obtained and shown to produce significant performance improvements; and the design advantages of coma-corrected non-Rowland geometries are explored. Ray tracings and deviation contours are provided.
Document ID
19850036466
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cash, W. C., Jr.
(Colorado, University Boulder, CO, United States)
Date Acquired
August 12, 2013
Publication Date
December 15, 1984
Publication Information
Publication: Applied Optics
Volume: 23
ISSN: 0003-6935
Subject Category
Instrumentation And Photography
Accession Number
85A18617
Funding Number(s)
CONTRACT_GRANT: NAG5-142
Distribution Limits
Public
Copyright
Other

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