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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 12 — Jun. 16, 2014
  • pp: 14041–14053

Probing transverse coherence of x-ray beam with 2-D phase grating interferometer

Shashidhara Marathe, Xianbo Shi, Michael J. Wojcik, Naresh G. Kujala, Ralu Divan, Derrick C. Mancini, Albert T. Macrander, and Lahsen Assoufid  »View Author Affiliations

Optics Express, Vol. 22, Issue 12, pp. 14041-14053 (2014)

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Transverse coherence of the x-ray beam from a bending magnet source was studied along multiple directions using a 2-D π/2 phase grating by measuring interferogram visibilities at different distances behind the grating. These measurements suggest that the preferred measuring orientation of a 2-D checkerboard grating is along the diagonal directions of the square blocks, where the interferograms have higher visibility and are not sensitive to the deviation of the duty cycle of the grating period. These observations are verified by thorough wavefront propagation simulations. The accuracy of the measured coherence values was also validated by the simulation and analytical results obtained from the source parameters. In addition, capability of the technique in probing spatially resolved local transverse coherence is demonstrated.

© 2014 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(050.1950) Diffraction and gratings : Diffraction gratings
(110.6760) Imaging systems : Talbot and self-imaging effects
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation

ToC Category:
X-ray Optics

Original Manuscript: February 19, 2014
Revised Manuscript: May 8, 2014
Manuscript Accepted: May 8, 2014
Published: June 2, 2014

Shashidhara Marathe, Xianbo Shi, Michael J. Wojcik, Naresh G. Kujala, Ralu Divan, Derrick C. Mancini, Albert T. Macrander, and Lahsen Assoufid, "Probing transverse coherence of x-ray beam with 2-D phase grating interferometer," Opt. Express 22, 14041-14053 (2014)

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