Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, Massachusetts, 02138-1596

99 -- CONCAVE MIRROR SOL RFP547-7-97 DUE 090397 POC Peter W. Sozanski, TEL. (617)495-7376, FAX (617)496-7692 The Smithsonian Astrophysical Observatory (SAO) requires the fabrication, test, and delivery of a concave mirror with a diametral clear aperture of 41.674 inches and a finished diameter of 42.174 inches. The mirror will be spherical, and the radius of curvature will be 53.1777 inches. The substrate will be Zerodur and the central thickness will be 1.55 inches. The mirror will be coated with overcoated UV-enhanced silver or the equivalent. Low order surface errors, characterized by Zernike polynomials through third order will be 2 waves RMS or better. Mid-spatial frequency error, characterized by RMS slope errors, will be 3.5 microradians RMS or better. Surface microroughness will be 20 angstrom RMS or better. A MIL 60/40 scratch-dig specification will be achieved. A small, 2.4 inch diameter hole will be drilled through the mirror at the center for alignment purposes. Proposers may coat the optic, or optionally propose that SAO undertake coating. The completed optic is to be delivered to SAO on or before 1 October 1998. Only written, fax (FAX #617/496-7692), or Internet (psozanski@cfa.harvard.edu) requests received directly from the requester are acceptable. All responsible sources may submit an offer. No telephone requests for the solicitation package will be accepted. (0192)

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