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Effects of Interference and Oxidation on the UV/Visible Rejection Properties of Filters for Soft X-ray Detectors |
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| Authors: | M Barbera A Collura A Dara M Leone FR Powell S Serio S Varisco MV Zombeck |
| Institution: | (1) Istituto ed Osservatorio Astronomico, G.S. Vaiana, Palermo;(2) Istituto per le Applicazioni Interdisciplinari della Fisica (CNR), Palermo;(3) Istituto di Fisica, Università degli Studi, Palermo;(4) Luxel Corporation, Friday Harbor, WA;(5) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA |
| Abstract: | We report on UV/Visible transmission measurements of aluminum coated Lexan filters designed as UV blocking filters for soft x-ray detectors. Transmission of the filters in the 2300-8000 Å wavelength range is significantly higher than expected. It cannot be accounted for applying a simple slab model of the transmission and adopting material properties reported in the literature. We show that this is due to interference effects which are strongly dependent on the filter geometry, and to oxidation of exposed aluminum surfaces and/or chemical interaction with the plastic support. The results of this work have led to the redesign of the Advanced X-ray Astrophysics Facility High Resolution Camera UV blocking filters. |
| Keywords: | X-ray calibration filters interference oxidation |
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