<title>Experimental characterization of Fresnel zone plate for hard x-ray applications</title>

Abstract

A series of experimental measurements was conducted for the characterization of a transmission circular zone plate. The zone plate (ZP), with a primary focal length of 40cm for 8keV photons, was illuminated by monochromatized synchrotron x-rays. Focusing efficiency of the ZP was measured as a function of x-ray energy between 5-llkeV, from which the ZP thickness was determined. Focal spot sizes at the 15t, 2nd, and 3rd order focus were measured, and they agreed very well with the calculated values. Images of a 1000 mesh/inch gold grid were also obtained at the three focal planes. The grid scans indicated that the spatial resolution is about 2 microns in the image obtained at the third order focus.