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Contrast optimization of Fresnel zone plate imaging.

D Haberberger1, A Shvydky1, P M Nilson1

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.

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|May 15, 2023
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Summary

Fresnel zone plates (FZPs) improve x-ray imaging resolution in laser-plasma physics. Calculations optimize FZP design by managing undiffracted x-rays, enhancing measurement contrast.

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Area of Science:

  • Laser-plasma physics
  • X-ray optics
  • Diffractive optics

Background:

  • Fresnel zone plates (FZPs) are diffractive lenses for x-rays, offering higher resolution than pinholes.
  • A significant challenge in FZP applications is the undiffracted zeroth-order x-ray beam, which creates background noise.
  • This background can be large and spatially inhomogeneous, complicating measurements.

Purpose of the Study:

  • To present calculations of diffracted (first-order) and undiffracted (zeroth-order) x-ray flux profiles for Fresnel zone plates.
  • To provide a method for optimizing the contrast between imaging rays and background noise.
  • To evaluate the effectiveness of a central blocking element in Fresnel zone plates.

Main Methods:

  • Numerical calculations of x-ray flux profiles for both diffracted and undiffracted orders.
  • Modeling of Fresnel zone plate geometry, including the potential implementation of a central stop.
  • Analysis of flux profiles to determine optimal experimental configurations.

Main Results:

  • Calculated flux profiles reveal the distribution of zeroth-order and first-order x-rays.
  • The calculations demonstrate how to optimize the signal-to-background ratio by adjusting experimental geometry.
  • The study presents calculations for a central block design to mitigate zeroth-order background.

Conclusions:

  • Understanding and quantifying zeroth-order flux is crucial for effective Fresnel zone plate utilization.
  • Optimized FZP design and experimental setup can significantly improve image contrast and data quality.
  • Implementing a central block is a viable strategy to suppress background noise in x-ray imaging with FZPs.