  The demands on optical components to tolerate high radiation dose and
manipulate hard x-ray beams that can fit the experiment requirements, are
constantly increasing due to the advancements in the available x-ray sources.
Here we have successfully fabricated the transmission type gratings using
diamond, with structure sizes ranging from few tens of nanometres up to
micrometres, and aspect ratio of up to 20. The efficiencies of the gratings
were measured over a wide range of photon energies and their radiation
tolerance was confirmed using the most intense x-ray source in the world. The
fidelity of these grating structures was confirmed by the quality of the
measured experimental results.
