EUV band-pass filters for the ROSAT wide field camera

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Abstract
Large-area thin-film bandpass filters have been constructed to provide four wavelength bands for the Wide Field Camera telescope on the Rosat satellite. The filters consist of a polycarbonate substrate coated with one of carbon, beryllium, or aluminum; additionally, a tin/aluminum filter is also available. These provide wavelength bands of mean wavelength 100, 140, 180, and 600 angstroms, respectively. This paper describes manufacture, and qualification details in the context of filters launched at ambient pressure, with a very stringent requirement for opacity, at around 1800 A, of better than 10 exp-8 of the filter area. Measures taken to protect filters against erosion by low earth orbit atomic oxygen are also briefly presented. Calibration procedures and results are discussed together with comparison of measured transmission profiles with those derived from published absorption coefficients over the range 40 to 2000 A.

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