Patent Number: 
Section: claims

1. A method for producing x-ray-optical gratings for x-ray dark field imaging and for x-ray phase contrast imaging, comprising the steps of:applying an x-ray-sensitive layer with an electrically conductive cover layer on a base plate;transferring a grating structure into the x-ray-sensitive layer with a lithographic method, creating exposed and unexposed regions;dissolving the exposed regions of the x-ray-sensitive layer so that a grating structure remains;introducing a metal into the grating interstices by electroplating;removing the x-ray-sensitive material and the base plate so a negative impression of a grating made of metal remains;producing a grating made of a first material with this negative impression that has a plurality of periodically arranged grating webs and grating openings; andfilling the grating openings with a second material by electroplating, by continuing the electroplating until a cohesive layer of the second material is created over the grating webs. 2. A method as claimed in claim 1, comprising employing a first material having an x-ray absorption coefficient that is lower than the x-ray absorption coefficient of the second material. 3. A method as claimed in claim 1 comprising producing the layer of the second material to a uniform height by polishing. 4. A method as claimed in claim 1 comprising implementing the electroplating to give the second material a layer thickness of at least 5 μm. 5. A method as claimed in claim 1 comprising implementing the electroplating to give the second material a layer thickness of at least 10 μm. 6. A method as claimed in claim 1 comprising employing a plastic as a first material. 7. A method as claimed in claim 6 comprising employing a polymethacrylate as the first material. 8. A method as claimed in claim 1 comprising employing an epoxy resin as the first material. 9. A method as claimed in claim 1 comprising employing a metal as the second material. 10. A method as claimed in claim 9 comprising employing gold as the second material. 11. A method as claimed in claim 9 comprising employing nickel as the second material. 12. A method as claimed in claim 1 comprising producing the grating with an aspect ratio of at least 50.