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Electroform replication of smooth mirrors from sapphire mastersA sapphire master was used to produce mirrors that exhibit mid-to-high-frequency roughness as low as 3 A. The fabrication procedure and potential applications in X-ray astronomy are discussed. It is shown that foils replicated from flat smooth mandrels should offer at least equivalent HF roughness and significantly lower mid-frequency ripple than those coated with lacquer. A ceramic-surface mandrel could also be expected to last far longer without the need for repolishing than electroless nickel-coated mandrels.
Document ID
19920073368
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Altkorn, R.
(Northwestern University Evanston, IL, United States)
Chang, J.
(Axonix, Inc. Evanston, IL, United States)
Haidle, R.
(Northwestern University Evanston, IL, United States)
Takacs, P. Z.
(Brookhaven National Laboratory Upton, NY, United States)
Ulmer, M. P.
(Northwestern University Evanston, IL, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Applied Optics
Volume: 31
Issue: 25 S
ISSN: 0003-6935
Subject Category
Optics
Accession Number
92A55992
Funding Number(s)
CONTRACT_GRANT: NAG5-181
Distribution Limits
Public
Copyright
Other

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