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Measurement of x-ray coherence using two-beam interferometer with prism optics

Yoshio Suzuki

Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Mikazuki, Hyogo 679-5198, Japan

(Received 13 November 2003; accepted 22 December 2003; published online 16 March 2004)

Two-beam x-ray interferometer using prism optics has been developed and applied to measurement of spatial coherence. Two-beam interferometry is made possible by using an x-ray prism as the beam deflector. A portion of the x-ray beam is deflected by the prism, and superimposed on the direct beam. This wavefront-dividing interferometer is essentially the same as well-known Fresnel's mirror experiment in visible light optics. Quantitative analysis of spatial coherence can be performed by measuring visibility of interference fringes. The experiment has been done at the undulator beamline 20XU of SPring-8. The measured visibility at an x-ray wavelength of 1 Å agrees well with theoretical value. Spatially coherent area larger than 0.5 mm was confirmed by analyzing the visibility of fringes. ©2004 American Institute of Physics.

doi:10.1063/1.1651640
PACS: 07.85.Fv, 41.50.+h        Additional Information

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