29 January 2004 Soft x-ray transmission of optical blocking filters for x-ray CCD camera onboard Astro-E2
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Abstract
We measured optical and soft X-ray transmission of Optical Blocking Filters (OBFs) for Charge Coupled Device (CCD) cameras, which will be launched as focal plane detectors of X-ray telescopes onboard the Japanese 5th X-ray astronomical satellite, Astro-E 2. The filters were made from polyimide coated with Al. The X-ray absorption fine structures (XAFSs) at the K edges of C, N, O and K and L edges of Al were measured. The depth of the absorption edge of O was deep, compared to the other elements of polyimide. This is evidence of the oxidation of Al. The optical transmission is roughly less than 10-6 except for a peak around the wave length of 550 nm. Long term change of the soft X-ray transmission was measured. No significant change of the thickness of the oxidation layer was found during half year.
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Shunji Kitamoto, Takayoshi Kohmura, Norimasa Yamamoto, Haruko Takano, Harue Saito, Kazuharu Suga, Hiroyuki Sekiguchi, S. Chiba, I. Okamoto, Kiyoshi Hayashida, Haruyoshi Katayama, Toyonaka Enoguchi, Yuusuke Nakashima, T. Shiroshouji, Yuzuru Tawara, Akihiro Furuzawa, Takeshi Tanaka, "Soft x-ray transmission of optical blocking filters for x-ray CCD camera onboard Astro-E2", Proc. SPIE 5168, Optics for EUV, X-Ray, and Gamma-Ray Astronomy, (29 January 2004); doi: 10.1117/12.505589; https://doi.org/10.1117/12.505589
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