Abstract
Abstract Designs for extreme-ultraviolet filters using thin carbon and beryllium foils are presented and their far-ultraviolet performance summarized. The transmission data yield values for the linear-absorption coefficients of beryllium and carbon in the wavelength range 1200–2000 A which are compared with other published data in this and in the adjacent extreme-ultraviolet wavebands. Use of multiple foils is demonstrated to be an effective means of eliminating pin-holes, which may contribute significantly to the far-ultraviolet transmission.
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