Abstract

The requirements of a small X-ray source size and large distance from the source which limit the coherence length in coherent X-ray scattering experiments can be avoided by Bragg diffraction on perfect crystals. The coherence in setups which include crystal diffraction is investigated. The coherence length, limited by the extinction length of the Bragg diffraction, can be comparable or larger than the one typically obtained by wave propagation in free space. The increase of the coherence length is demonstrated in a laboratory experiment on a periodic surface grating with variable period.

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