Image quality improvement in a hard X-ray projection microscope using total reflection mirror optics.

Area of Science:

• Optics and X-ray instrumentation
• Materials science and engineering

Background:

• Fabricating precise optical components is crucial for generating high-quality X-ray beams.
• Figure errors in mirrors can degrade beam uniformity and image quality.

Purpose of the Study:

• To develop and apply a new figure correction method for fabricating an elliptical mirror.
• To investigate the relationship between mirror figure errors and X-ray beam intensity uniformity.
• To achieve a one-dimensionally diverging X-ray beam with high image quality.

Main Methods:

• Application of a novel figure correction technique.
• Utilizing a wave-optical simulator to analyze figure errors and intensity uniformity.
• Employing microstitching interferometry and elastic emission machining for mirror fabrication.
• Experimental observation and evaluation at SPring-8 synchrotron facility.

Main Results:

• The study identified that short-wavelength figure errors significantly impact X-ray beam uniformity, causing interference fringes.
• Successful fabrication of an elliptical mirror with a lateral resolution of approximately 0.1 mm.
• The fabricated mirror produced a one-dimensional diverging X-ray beam with a sufficiently flat intensity distribution.

Conclusions:

• The developed figure correction method is effective for producing high-precision elliptical mirrors.
• Minimizing specific spatial wavelength figure errors is key to achieving uniform X-ray beams.
• The fabricated mirror enables high-quality X-ray imaging applications requiring one-dimensional divergence.