Sapphire hard X-ray Fabry-Perot resonators for synchrotron experiments

Area of Science:

• Materials Science
• Optics
• Crystallography

Background:

• Hard X-ray Fabry-Perot resonators (FPRs) are crucial for high-resolution X-ray optics.
• Sapphire (Al2O3) offers potential for fabricating these resonators due to its material properties.

Purpose of the Study:

• To construct and characterize hard X-ray Fabry-Perot resonators (FPRs) using sapphire crystals.
• To analyze the relationship between manufacturing accuracy, crystal defects, and resonator efficiency.
• To validate theoretical predictions of X-ray cavity resonance in sapphire FPRs.

Main Methods:

• Fabrication of monolithic sapphire FPRs from Al2O3 crystal plates.
• Characterization using hard X-rays at 14.3147 keV for backward reflection (00030).
• Theoretical analysis of X-ray cavity resonance and resonator efficiency.
• Microscopic analysis (SEM) and X-ray topography for crystal defect assessment.

Main Results:

• Successfully constructed and characterized sapphire FPRs.
• Obtained well-defined resonance spectra that closely matched theoretical predictions.
• Demonstrated the influence of dimensional accuracy and defect density on resonance efficiency.

Conclusions:

• Sapphire is a viable material for fabricating high-performance hard X-ray Fabry-Perot resonators.
• Manufacturing precision and crystal quality are critical factors for achieving optimal resonance efficiency.
• The experimental results validate theoretical models for X-ray cavity resonance in sapphire FPRs.