The practical use of a grazing x-ray telescope is demonstrated for hard-x-ray imaging as hard as 40 kev by means ora depth-graded d-spacing multilayer, a so-called supermirror. Platinum-carbon multilay-ers of 26 layer pairs in three blocks with a different periodic length d of 3-5 nm were designed to enhance the reflectivity in the energy range from 24 to 36 kev at a grazing angle of 0.3 deg. The multilayers were deposited on thin-replica-foil mirrors by a magnetron dc sputtering system. The reflectivity was measured to bo 25%-30% in this energy range; 20 mirror shells thus deposited were assembled into the tightly nested grazing-incidence telescope. The focused hard-x-ray image was observed with a newly developed position-sensitive CdZnTe solid-state detector. The angular resolution of this telescope was found to bo 2.4 arc rain iii the half-power diameter. # 1998 Optical Society of America OCIS codes: 110.8770, 230.4170, 350.1260, 340.7440, 340.7470.
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