Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, Massachusetts 02138-1516

99 -- ELLIPSOIDAL SOLID ALUMINUM MIRRORS SOL RFQ-BF1295 DUE 100798 POC Rena Cerbone, TEL. (617)495-7445, FAX (617)495-7485, email: rcerbone@cfa.harvard.edu The Smithsonian Astrophysical Observatory requires five (5) ellipsoidal solid aluminum mirrors, of a type designated M4 for SAO's submillimeter-wave feed optics for the Submillimeter Array Antennas. Summary properties of M4 are as follows: Overall dimension: 175mm x 155mm x 30mm; Focal lengths: F1=4230mm, F2=334.3mm; and Angle of incidence at vertex: 24.93 degrees. Surface specifications are as follows: Surface Accuracy (absolute): 3 microns RMS over entire surface, 1 micron RMS over the central region as indicated on the drawing to be provided. Surface Finish: Sufficiently specular to permit optical alignment. Less than 0.1% of surface area to be affected by voids or scratches. Coating: Surface protected by SiO overcoat approximately 0.1 microns thick, or a suitable alternative proposed by the manufactuer. Quotes must include a detailed description of the process which will be used to achieve the above tolerances. Verification of the surface RMS, and of the orientation of the surface relative to the fiducial tooling balls incorporated into the mirror block, shall be performed on a coordinate measuring machine. The surface measurement shall employ a rectangular grid of measurement points with a pitch no greater than 3mm. To ensure stability of the mirror surface over time, the vendor may choose an aluminum alloy and heat treatment sequence known to achieve satisfactory results with the vendors's fabrication process. This solicitation is unrestricted. All responsible sources may submit a quotation which will be considered. Quotations will be evaluated on price, contractor's past performance, delivery schedule, and contractor's technical description of the processes which will be used to achieve the above tolerances and stability of the mirror surface over time. Contractor's may request solicitation and drawing via fax to Rena Cerbone 617/495-7485 or mail to Smithsonian Astrophysical Observatory, 60 Garden Street, Mail Stop 22, Cambridge, Massachusetts 02138-1516, Attn: Rena Cerbone. The applicable SIC Code is 3827, size standard of 500 employees. This acquisition is being conducted under Simplified Acquisition Procedures (SAP). Posted 09/03/98 (I-SN245674). (0246)

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