Westinghouse Electric Corp., Bettis Atomic Power Laboratory, P.O. Box 79, 814 Pittsburgh-McKeesport Blvd., West Mifflin, PA 15122-0079

99 -- RUGATE FILTER DEVELOPMENT SOL 73-910175 POC M.R. Pasanek, (412) 476-5781 Provide technical information regarding Rugate Filter Development. Bettis is seeking a vendor that has the experience and the capability to design and fabricate rugate filters to provide selective spectral control on thermophotovoltaic (TPV) cells. The TPV cells are made of either an InP or an InPAs material, and are approximately 1cm square, and approximately .050 inches thick. The filter must be a pure rugate type (not a discrete filter, or a rugate approximation), and exhibit the following optical characteristics in the infrared wavelength range of interest: Absorption less than 5% in the wavelength range between 0.8 microns and 12.0 microns; Transmission greater than 90% in the wavelength range between 0.8 microns and 2.2 microns; Reflection greater than 95% in the wavelength range between 2.2 microns and 12.0 microns. If your organization has had experiences meeting these optical characterization limits in the wavelength ranges of interest, please notify M.R. Pasanek at the above address/phone number or FAX (412) 476-7320. If you have any technical questions about the above desired capabilities, please contact Ron Rometo at (412) 476-6015 or Jeff Csuy at (412) 476-6396. The FAX number for both Ron and Jeff is (412) 476-5151. Your review and associated comments are requested as soon as possible. (0052)

Loren Data Corp. http://www.ld.com (SYN# 0476 19970225\99-0004.SOL)