X-ray wavefront characterization of a Fresnel zone plate using a two-dimensional grating interferometer

Area of Science:

• Optics and photonics
• X-ray optics
• Wavefront characterization

Background:

• Fresnel zone plates (FZPs) are crucial optical elements for focusing and manipulating X-rays.
• Accurate characterization of the X-ray wavefront is essential for understanding and optimizing FZP performance.
• Aberrations in the X-ray beam can significantly impact imaging resolution and experimental outcomes.

Purpose of the Study:

• To characterize the X-ray wavefront downstream of a Fresnel zone plate (FZP).
• To investigate the sensitivity of the wavefront to the input beam characteristics.
• To differentiate between input beam aberrations and FZP-induced optical aberrations.

Main Methods:

• Utilized a two-dimensional grating interferometer for X-ray wavefront characterization.
• Employed raster phase-stepping scans to measure transverse wavefront slope maps.
• Introduced controlled astigmatism using compound refractive lenses to probe input beam effects.

Main Results:

• Accurate phase reconstruction of the X-ray beam was achieved through wavefront slope mapping.
• Wavefront error was found to be highly sensitive to the properties of the input X-ray beam.
• Experimental results demonstrated consistency with theoretical predictions regarding wavefront aberrations.

Conclusions:

• The characterization method provides precise X-ray wavefront measurements.
• Input beam quality is a critical factor influencing wavefront aberrations downstream of an FZP.
• Understanding these sensitivities is vital for advanced X-ray optics design and application.