A method of hard X-ray phase-shifting digital holography

Area of Science:

• Optics and Photonics
• Materials Science
• X-ray Imaging

Background:

• Digital holography offers 3D imaging capabilities.
• Hard X-ray applications require specialized holographic techniques.
• Phase-shifting algorithms enhance holographic reconstruction accuracy.

Purpose of the Study:

• To demonstrate a new phase-shifting digital holography method in the hard X-ray region.
• To develop an in-line holography setup for hard X-ray synchrotron sources.
• To enable accurate 3D shape measurement of micro- and nano-scale objects.

Main Methods:

• An in-line phase-shifting holography setup was implemented at a 6.80 keV hard X-ray synchrotron beamline.
• A phase plate with a hole and band was used at the Fresnel lens focus.
• A three-step phase-shift algorithm was employed for holographic reconstruction.

Main Results:

• Successful phase shifting of reference and objective beams was achieved.
• The system accurately measured the 3D shape of a gold test pattern.
• The morphology of a silica sphere was precisely reconstructed.

Conclusions:

• The demonstrated method provides a viable approach for hard X-ray digital holography.
• This technique enhances 3D imaging capabilities in the hard X-ray spectrum.
• The system is suitable for metrology and characterization of microstructures.