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

93 -- FUSED SILICA LENS BLANKS FOR WIDE-FIELD CORRECTOR SOL RFP516-12-94 DUE 022295 POC Contact Point, Peter W. Sozanski, 617/495-7376, Contracting Officer, George D. Dick, 617/495-7401, FAX 617/496-7692 Smithsonian Astrophysical Observatory (SAO) requires four fused silica lens blanks to be used in a refractive corrector for the f/5 focus of the Multiple Mirror Telescope (MMT). This corrector will be placed in operation after the MMT is converted to use a single 6.5 meter primary mirror. With the refractive corrector in place, the converted MMT will have a 1 degree diameter field-of-view, producing a focal surface approximately 0.61 meters in diameter. The useful spectral range of the corrector will be between wavelengths of 3200 Angstroms and 2 micrometers. The blanks to be provided have diameters ranging between 52 and 82 centimeters and center thicknesses of up to 11 centimeters. The two largest blanks must be sagged to radii of approximately 63 centimeters, but the two smaller blanks will have a plano-plano geometry. The refractive index homogeneity of the blanks should be better than 5x10-6 at 6328 Angstroms. The fused silica shall have fewer than 2 square millimeters of inclusions in any 100 cubic centimeters of volume. Given the spectral range of interest, we would prefer fused silica with a minimal OH content. Delivery of the blanks will be required by May 1995. Only written or faxed requests (FAX # 617/496-7692) received directly from the requestor are acceptable. All responsible sources may submit an offer. No telephone requests for the solicitation package will be accepted. (0364)

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