Referenceless, grating-based, single shot X-ray phase contrast imaging with optimized laser-driven K-α sources

Area of Science:

• Physics
• Materials Science
• Optics

Background:

• X-ray phase imaging is valuable for low-Z materials in biology, medicine, and high energy density (HED) physics.
• Traditional X-ray phase imaging methods use synchrotron light or X-ray tubes.
• Laser-generated X-ray sources offer unique properties but pose challenges for diagnostics.

Purpose of the Study:

• To develop and qualify a novel grating-based Talbot X-ray deflectometer (TXD) for laser-generated K-α X-ray sources.
• To investigate the impact of X-ray source chromaticity on TXD performance.
• To optimize TXD parameters for use with broadband, laser-produced X-ray sources.

Main Methods:

• Coupling a grating-based Talbot X-ray deflectometer (TXD) with multi-terawatt laser systems producing K-α X-rays.
• Characterizing X-ray emission from various laser-produced sources.
• Systematically qualifying laser, target, and deflectometer parameters to enhance TXD performance.

Main Results:

• Demonstrated the first referenceless grating-based X-ray imaging at high-power laser facilities.
• Identified X-ray source chromaticity as a critical factor affecting TXD image quality.
• Determined optimal parameters for TXD operation with broadband laser-generated X-ray sources.

Conclusions:

• The developed Talbot X-ray deflectometer (TXD) is suitable for characterizing laser-generated X-ray sources.
• This advancement enables new X-ray phase imaging applications in high energy density physics research.
• Optimizing TXD performance requires careful consideration of the broadband spectrum of laser-produced X-rays.