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Area of Science:

  • Optics and Metrology
  • Advanced Materials Science
  • Particle Accelerators

Background:

  • High-intensity, coherent X-ray sources like X-ray Free-Electron Lasers (XFELs) and synchrotrons demand ultra-precise optics.
  • Current surface figure metrology struggles with the steep and aspheric profiles of next-generation X-ray optics.
  • Sub-nanometer figure accuracy is essential for preserving wavefront quality and beam intensity.

Purpose of the Study:

  • Introduce a novel non-contact scanning profilometer for high-accuracy X-ray optic metrology.
  • Overcome limitations of conventional stitching interferometry, particularly cumulative errors.
  • Enable precise measurement of complex aspheric surfaces for advanced X-ray applications.

Main Methods:

  • Developed the Zero-method Scanning-probe Profilometer (ZSP), integrating a chromatic confocal sensor.
  • Employed a "zero method" measurement technique to eliminate sensor linearity errors.
  • Tested the ZSP on a steeply curved elliptical-cylindrical mirror with significant sag and grazing-incident angles.

Main Results:

  • Achieved a root-mean-square reproducibility of 1.3 nm on a challenging elliptical-cylindrical mirror.
  • Successfully validated the ZSP's performance in fabricating an X-ray nanofocusing mirror.
  • Demonstrated the ZSP's capability for measuring complex two-dimensional aspheric surfaces.

Conclusions:

  • The ZSP offers a significant advancement in ultra-precision metrology for X-ray optics.
  • The developed technique overcomes key challenges in measuring advanced optical components.
  • This method supports the development of future high-performance X-ray analytical techniques and facilities.