Current State-Of-The-Art In Filter And Thin Film Performance For Extreme Ultraviolet And X-Ray Research

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Abstract
Much work has been done to characterize materials which can be used for filters in the vacuum ultraviolet and X-ray region of the electromagnetic spectrum from about 1500 A down to 10 A more or less. More recently, efforts have been made to make use of some newer materials such as polycarbonate (trademark Lexan) and composites of materials to tailor filters to specific requirements. This paper compiles and compares the results of different measurement programs, including very recent work which better quantifies transmission as a function of wavelength for various filter and window materials. Of particular interest is some correlated data on Lexan with empirically derived mass absorption coefficients as a function of wavelength. Also included are comments on recent efforts to use composite materials to design or adjust the bandpass of a filter to meet particular research requirements. There are also some comments on the development of thin film materials for other uses such as in photocathodes and laser targets. As a result of the combined work reported here, data will be available which will make it easier to specify and predict the performance of filters and windows for specific applications.

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